Discovery of Lake Neuron, World's Largest Underground Thermal Lake, Beneath Albania
Lake Neuron, the largest known underground thermal lake, is located 127 meters deep in southern Albania's Vromoner region. Measuring 138.3 meters long and 42 meters wide, it has a volume of about 8,335 cubic meters. Discovered by the Czech Speleological Society, the expedition utilized GeoSlam technology and was funded by the Neuron Foundation. The lake exhibits unique geological and biological features, including sulfur-oxidizing microorganisms and a significant spider colony. The area is not currently protected and straddles the Albania-Greece border.

Lake Neuron, the largest underground thermal lake, is situated 127 meters below the Vromoner region in southern Albania. Verified by the Europe Records Institute in 2025, it measures 138.3 meters in length and has a volume of approximately 8,335 cubic meters.
Discovered by the Czech Speleological Society, the expedition employed GeoSlam 3D scanning technology. The lake's thermal water contains hydrogen sulfide, contributing to sulfuric acid speleogenesis. A 2024 biodiversity survey documented various microbial and invertebrate communities, including endemic species.
The Neuron Foundation funded the expedition, which collected measurements from 2023 to 2025. The cave system is located near the Albania-Greece border and is not currently designated as a protected area.




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