The scientific case for the region is staggering. In the Danakil Depression, researchers in 1995 unearthed a Homo erectus cranium designated UA 31, dated to approximately one million years ago, at the Uadi Alad locality within the Buia-Dandiero study area. Homo erectus was the first member of the human lineage to combine a large brain, long legs, and advanced survival skills, including the control of fire and possibly cooking. The same sedimentary basins have yielded dense clusters of Acheulean handaxes and cleavers—symmetrical stone tools that reflect sophisticated technological learning a million years before the present—alongside fossils of elephants, hippos, rhinoceroses, giraffes, and crocodiles that document a landscape far lusher than today’s hyper-arid desert.

Just as remarkable is what lies along the coast. At Abdur, on the eastern margin of the Gulf of Zula, archaeologists in the late 1990s discovered stone artifacts embedded within a fossil coral reef dated to roughly 125,000 years ago. The reef formed during Marine Isotope Stage 5e, a warm interglacial period when global sea level stood about eight meters higher than it does today. The find represents rare direct evidence of early humans living on a Red Sea shoreline during the last interglacial, and it has fueled the hypothesis that Eritrea’s 1,350-kilometer coastline served as a dispersal corridor for populations leaving Africa. From the Gulf of Zula, migrating groups could have trekked north along the western littoral toward the Sinai Peninsula and onward into Asia and Europe.

The corridor’s geology tells an equally dramatic story. The Gulf of Zula itself is a 40-kilometer-long marine bay formed as sea floor spreading propagated from the Red Sea into the Danakil Depression between roughly four and five million years ago. The Danakil Depression’s floor consists of thinned continental crust that may be as little as 14 kilometers thick in places, and the region has experienced repeated volcanism, faulting, and sedimentation over the past 34 million years. The Danakil Depression has been recognized by the International Union of Geological Sciences as one of the world’s 100 iconic geological heritage sites, a distinction shared by only the most exceptional landscapes on the planet.

Scattered across this rift floor are landforms of striking beauty and scientific value. Near the village of Irafaile rises the Dola volcanic cone, about 145 meters high with an 800-meter-wide crater rim, possibly formed when magma interacted explosively with external water in a process known as hydrovolcanism. Around the Alid rhyolite dome, some 25 kilometers south of Irafaile, a series of volcanic cones of varying sizes punctuates the landscape. Several hot springs along the southern margin of the Gulf and at the Alid dome attest to active heat flow beneath the thinning crust. Such springs are increasingly recognized as one of the fastest-growing sectors of world tourism, and studies in neighboring Ethiopia have documented therapeutic effects of hot spring bathing for musculoskeletal disorders, including rheumatoid arthritis.

The fossil reefs add another dimension. The Abdur Reef Limestone, composed of brain and branching corals, echinoderms, and mollusks, preserves a visible archive of sea-level and climate fluctuations that scientists say can be used to teach the public about future climate risks. During the Last Interglacial, the reef grew in a shallow, calm embayment; beneath it lies the older Buri Sequence, which records alternating shallow marine and lake environments. Because coastlines are being reshaped today by climate-driven sea level rise, the authors argue these exposed sequences offer visitors a tangible, place-based lesson in coastal vulnerability that no museum exhibit can replicate.

Human history layers on top of deep time. On the northwestern periphery of the Gulf of Zula stands Adulis, an ancient port town that flourished from roughly 1000 BC to 700 CE as a commercial gateway linking African, Asian, and Mediterranean civilizations. Recent excavations have exposed intact walls of palace and temple complexes whose elegant stone alignment testifies to advanced masonry skills and a highly structured society. One study of the site’s political economy suggests Adulis operated as an independent state, and archaeological accounts indicate its inhabitants deployed war elephants—a sign of sophisticated military logistics. Nearby, the Gelalo NW site on the Buri Peninsula, dated to the eighth millennium before present, yielded obsidian microliths and shell beads that demonstrate long-distance transport of marine resources to inland settlements as a risk-buffering strategy.

The region’s living cultures are integral to its appeal. The corridor is home to Saho and Afar communities whose nomadic pastoralism, artisan fishing, and indigenous knowledge systems represent time-tested adaptations to coastal and arid environments. The authors propose embedding these vernacular lifeways into tourism products—community-managed homestays, guided walks highlighting traditional navigation and resource use, and storytelling at volcanic and geothermal sites—so that visitor spending flows directly to residents. Salt mining in the Buri Peninsula’s Dagat salt-pan field, historically exchanged for grain and livestock, adds further cultural depth to the geoheritage narrative.

Why should Eritrea invest in geotourism now? The authors cite the economic power of heritage tourism, noting that the United States National Park Service generated $55.6 billion in economic output in 2023 alone. For Eritrea, geotourism offers a non-extractive, climate-resilient revenue stream that could create jobs in hospitality, transportation, and crafts while improving infrastructure that benefits other industries. Tourism can also serve as soft diplomacy, fostering people-to-people exchanges that build trust in a region with a history of conflict, and it can elevate the profile of a young nation whose extraordinary landscapes remain largely unknown internationally. Drawing on Self-Determination Theory, the authors note that tourists are intrinsically motivated by escape, relaxation, wonder, and knowledge—qualities the corridor delivers in abundance.

Realizing this potential demands serious groundwork. The authors call for a national geosite inventory combining geological mapping, condition assessments, and community consultation; formal protection of the Abdur reef, Buia-Dandiero localities, Adulis, and Buri Peninsula sites as geo-archaeological zones with buffer areas restricting quarrying and off-road vehicles; and pursuit of UNESCO Global Geopark status for the corridor. They propose branding the region as a “deep-time” living learning laboratory, with interpretive centers at Foro, Gelalo, Buia, and Adulis, QR-code audio guides, and exhibits at airports and embassies. Existing access is promising—a drivable coastal road from Massawa to Assab offers near-continuous views of the seascape, and lodging exists at Gelalo—but reliable transportation networks, communication systems, and visitor facilities remain essential. If safeguarded through enforceable policy and sustained research, the authors conclude, these rift, reef, fossil, and archaeological archives could become enduring pillars of education and development, reminding the world that even its most remote and forbidding terrains may hold the richest chapters of the human story.

Subject of Research: Geotourism potential of geoheritage and archaeo-paleontological sites in Eritrea's Gulf of Zula–Danakil corridor

Article Title: The geotourism potential of geosites and archaeo-paleontological landscape in the Gulf of Zula–Danakil corridor, Eritrea

Article References: Beyin, A., & Medin, T. (2026). The geotourism potential of geosites and archaeo-paleontological landscape in the Gulf of Zula–Danakil corridor, Eritrea. Discover Geoscience, 4(1), Article 399. https://doi.org/10.1007/s44288-026-00762-5

Image Credits: AI Generated

DOI: 10.1007/s44288-026-00762-5

Keywords: geotourism, Eritrea, Gulf of Zula, Danakil Depression, geoheritage, Homo erectus, Abdur reef, Adulis, East African Rift, human evolution, volcanic cones, hot springs

The Quaternary period, spanning roughly the last 2.6 million years, is a peculiar corner of Earth history. It accounts for only about 0.057 percent of the planet’s timeline, yet it supplies 17 percent of all World Heritage Sites characterised by geological features, from the karstic lakes of Plitvice in Croatia to the Lut Desert in Iran and the volcanoes of Hawaii. These are landscapes shaped by ice ages, shifting dunes, rising and falling seas, and the simultaneous unfolding of human evolution. In southeast Arabia, Quaternary deposits cover around 44 percent of the land surface, including aeolian dunes that dominate 57 percent of that area, alongside alluvial fans, fluvial channels, sabkha salt flats, caves and the remains of ancient palaeolakes. Because the region is arid and sparsely vegetated, these features are strikingly visible, unlike in humid landscapes where vegetation often hides them.

That visibility matters, because these sites are disappearing. A recent inventory of Quaternary palaeoenvironmental sites in the region found that 31 of 234 documented sites, about 13 percent, had already been destroyed, largely by urban development and quarrying, with another 34 sites classified as endangered. The Abu Dhabi Sabkha, a landscape of unique scientific value, has seen more than 60 percent of its area damaged by petroleum and civil engineering activity. Yet public appreciation of geoheritage lags far behind that of other sciences. On social media, the hashtag geology is used roughly 80 percent less often than physics, biology or chemistry, and television coverage of the geosciences tends to cluster around palaeontology, volcanoes and earthquakes.

To test whether cultural storytelling could close that gap, the team ran a three-phase study between November 2022 and January 2024. In the first phase, focus groups of academics, museum professionals and heritage administrators met at Buhais Geology Park in the UAE and the Oman National Museum. Their advice was concrete: begin with visually engaging footage of familiar places, build from general overviews to technical detail, incorporate archaeological, cultural and religious narratives where appropriate, keep the tone conversational and locally grounded, and frame geoheritage in terms of everyday values such as beauty, cultural relevance and conservation.

The second phase turned those recommendations into two videos, each just under nine minutes, the upper end of the six-to-nine-minute window that research on educational video suggests sustains attention best. The geocultural video devoted about 140 seconds, roughly 26 percent of its runtime, to cultural content, connecting dunes, caves, palaeolakes and sabkhas to the archaeology and heritage of early human settlement in Arabia. The control video replaced that material with additional Quaternary science. Both featured English narration, dialogues with local experts in Arabic, and subtitles, and both were piloted with focus group participants to check scientific accuracy and cultural representation.

The third phase was a randomised online experiment. Participants, all residents of the UAE or Oman, completed questionnaires before watching, immediately after, and three months later. Of 160 initial respondents, 104 completed the second wave and 82 completed all three, a drop-out rate within or better than the expected range for longitudinal studies. The sample skewed young, highly educated and environmentally engaged, with strong pro-conservation baselines: participants rated the importance of protecting natural heritage at 9.2 out of 10 before watching anything. Forty-eight participants were classified as domain specialists, geoscience students or professionals, and 56 as non-specialists. Even among specialists, only half could correctly identify Quaternary geoheritage sites at the outset.

The results, analysed with difference-in-differences models that isolate the effect of the cultural framing, revealed a nuanced trade-off. Immediately after watching, the science-focused video produced stronger gains on the objective knowledge test, a pattern driven entirely by specialist viewers. But that advantage evaporated by the three-month follow-up, when the two groups performed almost identically, with the geocultural group slightly ahead despite starting lower. Meanwhile, the geocultural video showed a clear and statistically significant advantage in sustaining interest in the relationship between Quaternary geology and archaeology, particularly among non-specialists, whose interest remained elevated at follow-up while the control group’s declined. Self-reported knowledge of that geocultural relationship stayed significantly above baseline in both groups three months on.

The most striking finding concerned conservation attitudes. Both videos increased viewers’ sense that Quaternary sites deserve protection, but the gains were consistently stronger and more durable in the geocultural group, an effect most pronounced among non-specialists, who started from lower baselines and therefore had more room to move. Qualitative feedback reinforced the pattern: geoheritage protection was the most frequently cited takeaway among treatment-group viewers, who also tolerated the video’s length better and asked for more content rather than less. Roughly half of participants in each group reported watching the video more than twice, and 91 percent of all respondents said their interest in Quaternary geoheritage had increased.

The authors are careful about the limits of their evidence. With 82 complete cases, the study is underpowered to detect small effects, and many estimates carry wide confidence intervals. The sample cannot represent the region’s 14.1 million residents, being dominated by university students and adults with pre-existing pro-nature views. Still, the pattern echoes earlier work, such as a study in St. Vincent where a video game taught volcanic hazards slightly less effectively than a traditional lecture but engaged learners more deeply. The parallel suggests a general principle: adding narrative or cultural framing may dilute short-term factual delivery while buying something more valuable, namely attention that lasts.

The practical implication is that communicators should match the framing to the goal. If the aim is immediate factual learning, a focused, technical presentation may win. If the aim is to make ancient landscapes feel relevant, memorable and worth defending, human stories appear to be the stronger tool. For Quaternary science, a field whose subject matter, deep time, is notoriously hard for non-specialists to grasp, the cultural bridge may be exactly what turns abstract geology into a cause people care about, three months later and beyond.

Subject of Research: Testing whether geocultural context in educational videos improves public communication of Quaternary geoheritage in southeast Arabia

Article Title: Including cultural context improves communication outcomes for quaternary geoheritage: evidence from southeast Arabia

Article References: Including cultural context improves communication outcomes for quaternary geoheritage: evidence from southeast Arabia. (n.d.). https://doi.org/10.5194/gc-9-291-2026

Image Credits: AI Generated

DOI: 10.5194/gc-9-291-2026

Keywords: geoheritage, Quaternary science, science communication, geocultural context, Oman, United Arab Emirates, educational video, conservation attitudes, archaeology, geotourism, public engagement, difference-in-differences

The Noun Plain is, in volcanological terms, a compressed textbook. Within a few tens of kilometers, phreatomagmatic maars formed where rising magma met groundwater, basaltic scoria cones built by Strombolian explosions, polygenetic volcanic complexes, and felsic intrusive domes all coexist in unusual spatial proximity. The basement consists of Pan-African granitic plutons and migmatitic gneisses, dissected by major tectonic fractures that channeled successive eruptions. Regional volcanism unfolded in three macro-phases: an early fissural effusive episode producing Tertiary flood basalts and rhyolites, a central phase constructing viscous rhyolitic domes and flows, and a final Plio-Quaternary explosive phase of synchronized Strombolian and phreatomagmatic events that sculpted the modern landscape. The erupted products trace a classic alkaline lineage from basanites and alkali basalts to trachytes and rhyolites, and recent petrological work on young pyroclastic deposits at Petpenoun and Baïgom has yielded clues about garnet-lherzolite mantle sources beneath the line.

To evaluate this heritage objectively, the team applied the Brilha methodology, a widely used quantitative framework that deliberately separates scientific value from potential educational and touristic use, and adds a degradation risk module. Scientific value was scored across seven criteria, with representativeness weighted at 30 percent, key locality at 20 percent, and integrity and rarity at 15 percent each, producing standardized scores from 100 to 400 points. Potential educational use emphasized accessibility and school-group suitability, while potential touristic use weighted landscape quality and accessibility at 15 percent each and explicitly credited the region’s Bamoun intangible cultural history. Degradation risk combined five factors, dominated by the vulnerability of geological components at 35 percent, alongside proximity to degrading activities, legal protection, accessibility, and population density. Nineteen geosites were classified into four morpho-volcanic categories: maars, scoria cones, polygenetic complexes, and felsic intrusive products.

The scientific headline is the Mbapit Massif, whose rhyolitic peak scored 395 for scientific value, the joint highest in the inventory. The massif is a composite volcano-plutonic complex reaching 1,988 meters, encompassing the South Volcano and the Mfou maar, and it provides outstanding morphological evidence of bimodal magmatism, the coexistence of mafic and felsic melts that marks a critical stage in the evolution of the Cameroon Volcanic Line. Equally significant are the Nkoambeng and Kechuentim scoria cone complexes, which scored 395 and 380 respectively. Their pyroclastic successions contain green-core clinopyroxenes, iron-rich crystal cores mantled by magnesium-rich rims, which microprobe analyses have shown to be direct petrographic evidence of deep magma mixing and mantle source heterogeneity. These small green-zoned crystals, invisible to casual visitors, record open-system magmatic processes operating beneath the African lithosphere, placing the Noun Plain on the global petrological map.

Lake Monoun, scoring 390 for scientific value, carries a darker and world-famous legacy. In 1984 the lake released a limnic eruption, a catastrophic burst of carbon dioxide that had accumulated in its deep waters, killing dozens of people and launching decades of international research on gas-charged crater lakes. The lake’s polygenetic maar structure, with internal walls exposing listric faults in the Pan-African basement, now doubles as an exceptional outdoor classroom, and its position near major roads makes it readily accessible to school groups. The study stresses that continued geochemical monitoring of Monoun remains essential, both as a hazard mitigation priority and as a living scientific record of one of the planet’s rarest natural phenomena.

Where the science peaks, so does the culture. Petpenoun, a rare volcanic dam formed when ancient Nkoambeng lava flows blocked the local river system to create twin lakes, earned the highest touristic score of the entire assessment at 395. Its geological origin maps directly onto the Bamoun Legend of the Twins, a mythological account of the lakes’ creation, and the site’s low degradation risk of 120 suggests this fusion of natural and cultural heritage is being conserved effectively. Lake Mfouet offers an even more striking example: its emerald waters serve as the permanent site of Bamoun community initiation rites, and that sacred status has achieved what formal law has not, holding degradation risk to just 180 in a region where legal protection is largely absent. The authors argue that such traditional taboos function as an invisible but highly effective governance tool.

The contrast with the study’s starkest numbers could not be sharper. The Njigoumbe intrusive dome, despite its scientific importance, recorded the maximum degradation risk of 400 in the entire inventory, driven by intense industrial quarrying, while the Chapchap cone scored 380 under combined pozzolan extraction and agricultural expansion. Nkoambeng itself faces a risk score of 360. These figures, the researchers write, expose a systemic failure in territorial management: geosites treated as material mines rather than non-renewable natural heritage. Their proposed remedy is a multi-use zonation strategy, with sanctuary zones fully protecting unique features such as the clinopyroxene-bearing outcrops, controlled buffer zones permitting limited artisanal extraction on less significant flows, and economic reorientation toward geotourism anchored at Petpenoun’s existing facilities.

To translate the scores into action, the team lays out a four-phase roadmap toward a UNESCO candidacy. Phase one secures national natural monument status for top-tier sites and delineates the Geopark perimeter. Phase two establishes a management body integrating regional administrators with traditional Bamoun authorities, paired with training programs for local youth. Phase three deploys multilingual interpretive signage in French, English, and Bamoun at hubs such as Mfoumben, an archetypal stratovolcano with the region’s highest educational score at 380, and Lake Monoun. Phase four links individual trails into a unified geocultural circuit, including a proposed bridge over the Noun River to connect the Neghop-Ghang and Mfouet clusters into a one-day itinerary, culminating in submission of the formal application to the UNESCO Secretariat. Training young Bamoun geoguides is central, converting volcanic landscapes into livelihoods that do not require their destruction.

The broader significance extends well beyond Cameroon. Africa remains dramatically underrepresented on the UNESCO Global Geopark list, and the Noun Plain study offers a replicable template for other under-documented volcanic regions: merge existing regional inventories, apply a standardized quantitative framework that decouples science from tourism, and build conservation on cultural foundations that already exist. The Water and Fire framework, pairing the plain’s hydrovolcanic lakes and maars with its scoria cones and magmatic intrusions, demonstrates how geodiversity can be structurally rooted in local identity rather than imposed from outside. If the roadmap succeeds, the plain where killer gases, green-cored crystals, and sacred twin lakes coexist could become Central Africa’s next World-class geoscience destination, proving that the most effective protection for geological heritage is sometimes written not in legislation but in legend.

Subject of Research: Quantitative geoheritage assessment of volcanic geosites in the Noun Plain, Cameroon, for UNESCO Global Geopark candidacy

Article Title: Quantitative assessment and valorization of the Noun Plain volcanic geoheritage in Cameroon for a UNESCO Global Geopark

Article References: Ziem à Bidias, L. A., Mouchili Nguegni, S., Kouske, A. P., Ilouga, D. C. I., Njeuatchoua Kameni, L. H., Nsangou, A., Kenna, H. S., Moundi, A., & Kamgang, P. (2026). Quantitative assessment and valorization of the Noun Plain volcanic geoheritage in Cameroon for a UNESCO Global Geopark. Discover Geoscience, 4(1), Article 328. https://doi.org/10.1007/s44288-026-00698-w

Image Credits: AI Generated

DOI: 10.1007/s44288-026-00698-w

Keywords: geoheritage, geotourism, UNESCO Global Geopark, Cameroon Volcanic Line, Noun Plain, maars, scoria cones, bimodal magmatism, magma mixing, Lake Monoun, Bamoun culture, geoconservation

The tool at the heart of the study is the Modified Geosite Assessment Model, or M-GAM, a quantitative method that evaluates geosites on two complementary dimensions. The Main Value (MV) captures intrinsic scientific and educational qualities: how representative a landform is of regional geomorphic processes, how rare it is, how well it records geological history, and how intact it remains. The Additional Value (AV) covers the practical and experiential attributes that determine whether a site can actually attract and serve visitors: accessibility, infrastructure, scenery, safety, and the presence of interpretive facilities. By separating what a site means from what a site offers, the model prevents spectacular but remote landforms from being judged by the same criteria as accessible viewpoints, and vice versa.

What distinguishes this application from earlier uses of the model is its dual-audience design. Experts scored each geosite on 27 standardized sub-indicators, but the researchers then modified those expert judgments with importance factors (Im) derived from visitors themselves. A structured survey collected opinions from 202 respondents, whose ratings of how much weight each attribute deserved were folded into the expert assessment. This is a meaningful methodological refinement: geotourism planning often fails because scientists and tourists value different things, and a ranking that ignores visitor priorities risks protecting sites nobody visits while promoting sites with little scientific substance. The visitor survey instrument showed acceptable internal consistency, with Cronbach’s alpha of 0.79 for the Main Value subscale and 0.84 for the Additional Value subscale, indicating that respondents answered in a coherent and reliable pattern.

The results reveal striking variability across the state’s inventory. Scores differed widely on all five attribute clusters the authors examined: scientific and educational value, scenic and aesthetic appeal, protection status, functional capacity, and touristic potential. Perhaps the most telling headline number is the comparison of the two value dimensions. The mean Additional Value score across the 42 geosites was 11.90, notably higher than the mean Main Value score of 8.53. In plain terms, the sites of West Bengal, on average, offer better functional and tourism-supporting conditions than their intrinsic scientific scores alone would suggest, and those practical attributes pull substantial weight in the final relative rankings. For planners, this means that infrastructure and access, not just geological significance, drive which sites rise to the top.

Using quartile-based thresholds within the study inventory, the team sorted the 42 geosites into three priority classes: 13 sites of relatively high priority, 18 of moderate priority, and 11 of low priority. This relative classification is deliberately comparative rather than absolute; a site’s rank depends on how it performs against the other sites in the same dataset, which makes the method well suited to allocating limited conservation and promotion budgets across a state-wide portfolio. The high-priority group represents the landscapes where scientific value, visitor experience and management readiness converge, and where investment in geotourism is most likely to pay both educational and economic dividends.

Correlation analysis of the model’s components added quantitative texture to these patterns. Accessibility correlated strongly with visitor numbers (r = 0.74), a relationship that will surprise no one who has watched a well-paved viewpoint outdraw a more remarkable but unreachable landform. The correlation between the touristic component and Additional Value was even stronger (r = 0.81), but the authors treat this figure with appropriate caution, because the touristic component is itself part of the Additional Value construct, making the association partly circular. This kind of statistical self-awareness is a strength of the paper: rather than presenting every correlation as a discovery, the authors flag which relationships are independent evidence and which are artifacts of how the model is built.

One of the most interesting analytical moves in the study is the direct comparison of expert and visitor assessments, which identifies sites where geomorphological significance and perceived importance either converge or diverge. Convergence suggests a site where scientific merit and public appeal reinforce each other, the ideal profile for flagship geotourism destinations. Divergence cuts both ways: some sites of genuine scientific importance score poorly with visitors, often because they lack the scenery, access or interpretation that makes geomorphology legible to non-specialists, while other visually spectacular sites may attract crowds without carrying exceptional scientific weight. Mapping these convergences and divergences gives managers a practical triage tool, showing where investment in trails, signage and interpretation could close the gap between what a landform is and what visitors think it is.

The geographic sweep of the inventory is itself a contribution. Geosite assessments have often focused on single provinces, a mountain range or a coastline, evaluated in isolation. By sampling across the Himalaya, the Sub-Himalayan piedmont, the plateau, the fluvial plains, the delta and the coast within one consistent framework, the study makes it possible to ask, for the first time in this region, which landscape types deliver the highest combined value. That matters for a state whose geomorphic identity is defined by this extraordinary gradient, and it matters for geotourism strategies that could link sites into itineraries tracing the full descent from high mountains to the sea.

The authors are candid about the uncertainties inherent in the approach. Visitor sampling may not represent the full population of potential tourists; expert scoring involves judgment calls; the weighting and aggregation of sub-indicators embed assumptions; and the quartile-based classification is relative, meaning a different inventory could reshuffle the ranks. None of these caveats undermines the core contribution, which is to demonstrate M-GAM as a comparative decision-support framework. The study was approved by the Institutional Ethics Committee of the Department of Geography at Syamaprasad College, conducted in accordance with the Declaration of Helsinki, and carried out with informed consent from all survey participants. The authors declare no competing interests, and the work received no external funding.

Published as an open-access article on 30 September 2026, the paper arrives at a moment when geotourism is gaining traction as a sustainable alternative to mass tourism in ecologically sensitive regions. For West Bengal, the practical implications are concrete: the 13 high-priority geosites form a ready-made shortlist for infrastructure investment, interpretation programs and heritage designation, while the divergent sites identified through the expert-visitor comparison point to where low-cost interventions such as signage and access improvements could unlock hidden value. More broadly, the study offers a template that other geomorphologically diverse regions, from Andean valleys to Rift Valley escarpments, could adapt. By putting numbers on the sometimes vague language of geoheritage, and by insisting that visitors have a formal voice in how landforms are valued, the research moves geosite assessment from description toward decision, and gives the landscapes of West Bengal a quantified case for the protection and promotion they have long deserved.

Subject of Research: Quantitative assessment and prioritization of geomorphosites for geotourism and geoheritage conservation in West Bengal, India

Article Title: Geomorphosite assessment and prioritization across diverse landscapes of West Bengal India using expert and visitor modified geosite assessment model

Article References: Bhandari, U., Mondal, S., Basak, I., Roy, M., Koley, B., Das, S., & Nath, A. (2026). Geomorphosite assessment and prioritization across diverse landscapes of West Bengal India using expert and visitor modified geosite assessment model. Discover Sustainability. https://doi.org/10.1007/s43621-026-04880-5

Image Credits: AI Generated

DOI: 10.1007/s43621-026-04880-5

Keywords: geomorphosites, geosites, geoheritage, geodiversity, geotourism, M-GAM, West Bengal, Eastern Himalaya, Ganges Delta, sustainable tourism, site assessment, geomorphology

Sabkhas form under arid to hyper-arid climates where evaporation persistently exceeds rainfall and groundwater lies close enough to the surface for capillary rise to deliver moisture into the evaporation zone. The review distinguishes two dominant types in the UAE. Coastal sabkhas, exemplified by the Abu Dhabi shoreline, sit within supratidal to marginal intertidal zones and are sustained by episodic marine flooding, tidal pumping, lagoonal exchange and saline groundwater circulation. Inland sabkhas, such as the vast Sabkha Matti that extends roughly 150 kilometres from western Abu Dhabi into Saudi Arabia, occupy continental depressions and interdune corridors where groundwater discharge and intense evaporation dominate, with little direct marine input. Both settings share the same fundamental process chain: capillary ascent, evaporative concentration, evaporite crystallization and early cementation, yet their differing hydrologic connectivity produces distinct brine chemistries and mineral assemblages.

The geological setting of the UAE gives these systems unusual scientific richness. The Abu Dhabi coastal plain is an exceptionally low-gradient carbonate ramp where offshore shoals, barrier islands and restricted lagoons dampen wave energy and allow broad tidal flats to prograde seaward. Facies belts trace an orderly progression from subtidal carbonate shoals through lagoons and tidal channels into a shoreline-parallel belt of polygonal microbial mats and finally onto supratidal sabkha plains. Because these belts are preserved as vertically stacked Holocene packages, geologists can walk laterally across modern environments and read the same succession downward in cores. This direct process-to-product linkage is why the Abu Dhabi sabkhas became the type analogue for ancient carbonate–evaporite reservoir–seal systems across the Arabian Plate, including the Upper Jurassic Arab Formation.

The Mussafah Channel, a man-made canal cut through the coastal plain, has proven especially instructive. Its walls expose a well-constrained Holocene succession in which Pleistocene aeolian deposits are overlain by lagoonal and tidal-channel carbonates, microbial mat facies and supratidal sediments overprinted by evaporite mineralization. The stacking records a post-glacial marine transgression followed by regression and progressive sabkha development, providing a high-resolution template for reconstructing facies architecture and early diagenesis in subsurface reservoirs. Quantitative comparisons between modern surfaces and shallow subsurface successions have shown that many environmentally diagnostic structures, from microbial polygons to halite crust morphologies, retain recognizable signatures during early burial, strengthening confidence in facies-based analog applications.

One of the most celebrated contributions of the UAE sabkhas lies in addressing the long-standing Dolomite Problem: the puzzle of how abundant dolomite forms at low temperatures when laboratory experiments struggle to precipitate it. Cryo-scanning electron microscopy has revealed authigenic dolomite crystals nucleating within the extracellular polymeric substances of Abu Dhabi microbial mats, and laboratory studies with sulfate-reducing bacteria isolated from the sabkha have reproduced poorly ordered Ca-dolomite and very high-Mg calcite under simulated pore-water conditions. These findings establish microbial mats as geochemical micro-reactors that locally modify pH, alkalinity and magnesium-to-calcium ratios, demonstrating that low-temperature dolomitization in evaporitic settings is fundamentally microbially mediated rather than a simple consequence of evaporation.

The hydrogeochemistry of the coastal sabkha is equally counterintuitive. Water-budget and mass-balance analyses show that most water entering the shallow sabkha aquifer is meteoric, derived from infrequent but efficiently infiltrating rainfall, whereas more than 95 percent of the dissolved solutes ascend from continental brines in underlying Tertiary formations. This decoupling between water sources and solute sources explains why marine-like evaporite assemblages develop even where modern marine flooding is sporadic. The characteristic mineral sequence of carbonate, gypsum and anhydrite, then halite, reflects recurrent concentration–reset cycles driven by evaporation, flooding and brine–sediment interaction rather than a single linear evaporation path. Density contrasts between concentrated near-surface brines and dilute underlying groundwater even drive free convection, first documented at field scale in the Abu Dhabi aquifer, redistributing solutes and shaping cementation patterns.

The review also brings radiogeochemistry into the framework. Natural radioelement distributions prove strongly facies-dependent: potassium-40 and thorium-232 track detrital inputs of K-bearing silicates, clays and heavy minerals inherited from desert dunes and the ophiolite-dominated Hajar Mountains, while uranium behaves far more dynamically, migrating as uranyl–carbonate complexes in oxidizing alkaline brines and immobilizing in reducing microbial mat microenvironments. Radium, by contrast, can be trapped through substitution into the abundant gypsum and anhydrite that pervade sabkha soils, making sulfate horizons potential radiogeochemical sinks. The authors argue that robust environmental baselines therefore require sampling stratified by facies and depth rather than treating sabkhas as uniform salt flats.

On the question of critical elements, particularly lithium, the synthesis is deliberately cautious. Lithium remains in solution through early evaporation and concentrates mainly in late-stage, bittern-like residual brines enriched in magnesium, potassium, bromine and boron. Whether UAE sabkhas reach that stage depends on hydrologic restriction, residence time and flushing frequency, and the reviewers note that facies-resolved lithium datasets for UAE sabkhas are effectively absent from the open literature. Regional benchmarks, including lithium concentrations of roughly 0.2 to 0.3 milligrams per litre measured in Arabian Gulf desalination brines, and the persistent technical obstacle posed by high magnesium-to-lithium ratios in direct extraction technologies, all counsel against assuming inherent high-grade enrichment. The authors instead propose a staged screening strategy: vertical porewater profiling across representative facies, quantification of lithium alongside its chemical companions, seasonal repetition to capture evaporation and flooding cycles, and integration with techno-economic and environmental assessments before any resource claims are made.

Finally, the review elevates the sabkhas to geoheritage priorities. Abu Dhabi Sabkha is listed on UNESCO’s World Heritage Tentative List, recognized for the completeness of its roughly 7,000-year-old system, where subtidal lagoon muds, intertidal microbial mats and supratidal gypsum and anhydrite nodules co-occur within a single locality. Yet the scientific archive is disappearing fast: studies estimate that of about 150 kilometres of coastal sabkha present in the 1960s, only around 36 percent remained by the early 2010s, lost to industrial and urban encroachment. The reviewers call for protected reference zones, controlled access and integration of research with public interpretation, framing the sabkhas not as wasteland but as irreplaceable outdoor laboratories. From reservoir calibration and lithium screening to radon baselines and geotechnical risk in sulfate-cemented soils, they conclude, the fate of these reactive evaporitic systems now matters far beyond the shorelines of the southern Gulf.

Subject of Research: Integrated sedimentology, hydrogeochemistry, geomicrobiology and resource potential of UAE sabkha carbonate–evaporite systems

Article Title: Sabkha systems of the United Arab Emirates as integrated carbonate–evaporite laboratories: facies architecture, brine evolution, critical-element potential, and geoheritage significance

Article References: Abukhadra, M. R., Al-zharani, M., Allam, A. A., Hamdan, M. A., Szűcs, P., & Eid, M. H. (2026). Sabkha systems of the United Arab Emirates as integrated carbonate–evaporite laboratories: facies architecture, brine evolution, critical-element potential, and geoheritage significance. Environmental Earth Sciences, 85(16), Article 411. https://doi.org/10.1007/s12665-026-13146-2

Image Credits: AI Generated

DOI: 10.1007/s12665-026-13146-2

Keywords: sabkha, United Arab Emirates, evaporites, carbonate sedimentology, brine geochemistry, dolomite, microbial mats, lithium, radioactivity, Abu Dhabi, geoheritage, reservoir analogue