Mawmluh Cave

Mawmluh Cave
Name	Mawmluh Cave
Location	Meghalaya, India
Coordinates	25°18′N 91°52′E
Depth	200+ m
Length	~7 km
Geology	Limestone, karst

Mawmluh Cave Mawmluh Cave is a limestone karst system in the East Khasi Hills district of Meghalaya, India, notable for long passages, large chambers, and extensive speleothem deposits. The cave has been the focus of geological, hydrological, and paleoclimatic research by institutions such as the Geological Survey of India, the University of Cambridge, and the National Centre for Earth Science Studies. It lies within a landscape characterized by tropical monsoon influence and complex Shillong Plateau topography, attracting speleologists from across South Asia and beyond.

Geography and geology

The cave is located near the village of Mawlynnong and the town of Cherrapunji (Sohra) on the Shillong Plateau, southwest of Shillong. Formed in Paleoproterozoic to Neoproterozoic carbonate sequences within the Garo-Khasi-Jaintia block, Mawmluh occupies a karstified belt underlain by massive limestone and minor dolomite units correlated with regional stratigraphy studied by the Geological Survey of India and researchers from Indian Institute of Science. Structural controls such as the Dapsi Fault system and jointing related to the Himalayan orogeny influence passage orientation and chamber development. Speleogenetic processes include dissolution by carbonic and sulfuric acid sourced from soil respiration and deep-seated fluids, consistent with models developed at the British Geological Survey and INQUA. The cave's planform and cross-sectional morphology record phases of vadose and phreatic development comparable to caves documented in Mekong Basin karst and the Yucatán Peninsula.

History and exploration

Local Khasi communities knew of the entrance long before formal scientific attention, with early accounts appearing in reports by the Geological Survey of India during the British colonial period alongside exploration by members of the Royal Geographical Society and missionaries stationed on the Shillong Plateau. Systematic speleological surveys began in the late 20th century with expeditions involving Indian Mountaineering Foundation, North East Hill University, and international teams from University of Cambridge and University of Innsbruck. Cave mapping efforts employed techniques pioneered by the British Speleological Association and modern laser scanning protocols used by the International Union of Speleology. Notable exploratory milestones were published in journals associated with the Indian Academy of Sciences and presented at meetings of the International Union for Quaternary Research (INQUA).

Paleoclimatic significance and speleothems

Mawmluh contains well-preserved stalagmites and flowstones that have yielded high-resolution paleoclimate records through uranium-thorium dating and stable isotope analysis conducted by teams affiliated with PAGES, International Continental Scientific Drilling Program, and the National Centre for Antarctic and Ocean Research. Speleothem chronologies from Mawmluh have provided insights into Indian Summer Monsoon variability, teleconnections with the El Niño–Southern Oscillation, and Holocene hydroclimatic shifts correlated with records from Greenland ice cores, Cariaco Basin sediments, and Lake Baikal proxies. Geochemical fingerprints, including trace elements and δ18O/δ13C ratios, were interpreted using methods developed at Max Planck Institute for Chemistry and the University of Oxford isotope laboratories. These records contributed to the stratigraphic proposal for the Anthropocene by groups associated with the Anthropocene Working Group due to the presence of a distinct geochemical marker horizon.

Hydrology and cave ecosystem

Hydrological dynamics of the cave reflect monsoonal recharge, conduit flow, and seasonal flood pulses documented alongside studies of Meghalaya river systems such as the Umngot River. Dye-tracing and discharge monitoring performed with protocols from the International Association of Hydrological Sciences have elucidated recharge sources, conduit connectivity, and groundwater residence times. The cave supports troglobiotic and troglophilic fauna studied by biologists from Zoological Survey of India and universities including North Eastern Hill University; taxa include cave-adapted arthropods, collembolans, and microbial biofilms analogous to communities described from Krem Liat Prah and Mawsmai Cave. Microbial mats in Mawmluh have been examined for chemoautotrophic processes similar to sulfur-driven ecosystems documented by researchers at Scripps Institution of Oceanography and Woods Hole Oceanographic Institution.

Cultural and socio-economic importance

The cave lies within Khasi traditional territory where oral histories, ritual practices, and folklore linked to karst landscapes persist among communities in East Khasi Hills district and villages like Mawlyngbna. Mawmluh attracts eco-tourism and caving visitors contributing to local livelihoods alongside attractions such as Nohkalikai Falls and Double Decker Living Root Bridge; tourism development has involved stakeholders including the Meghalaya Tourism Department and community-based cooperatives. Academic collaborations have brought funding and capacity-building via grants from organizations such as the Department of Science and Technology (India) and international research councils, intersecting with regional planning by the Northeastern Council.

Conservation and management

Conservation concerns include anthropogenic impacts from unregulated tourism, land-use change in the Shillong Plateau catchments, and water quality pressures linked to agricultural runoff and mining activity monitored by the Ministry of Environment, Forest and Climate Change and the Central Pollution Control Board. Management strategies promoted by NGOs, municipal authorities in East Khasi Hills district, and academic partners emphasize integrated karst management, protected area designation similar to those advocated by the IUCN, and community-led stewardship modeled on initiatives in Ha Long Bay and Phong Nha-Ke Bang National Park. Ongoing monitoring employs protocols from the International Union for Conservation of Nature and scientific collaborations with institutions including Indian Institute of Technology Guwahati and the Geological Survey of India to balance research, tourism, and cultural values.

Category:Caves of Meghalaya