The spectacular and unusual St-Léonard underground lake is the largest such lake in Europe. 300m long, 20m wide and 10m deep, this is the largest navigable underground lake in Europe. Guided tours of this unusual and mysterious site, lasting over half an hour, are given in French, German, Italian and English.
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Veryovkina Cave (also spelled Verëvkina Cave, Abkhaz: ????????? ?????, Georgian: ??????????? ??????, romanized: veriovk'inis mghvime) is a cave in Abkhazia, an occupied region of Georgia. At 2,223 meters (7,257 ft) deep, it is the deepest-known cave on Earth.
The longest subterranean river in the world is the Sistema Sac Actun cave system in Mexico. Subterranean rivers can also be the result of covering over a river or diverting its flow into culverts, usually as part of urban development.
An endorheic lake is a lake that doesn't drain towards the ocean. The word endorheic stems from Ancient Greek: ??d??, éndon, “within” and ?e??, rheîn, “to flow”. These lakes are also known as terminal lakes, closed lakes, or sink lakes.
Situated in south-east Siberia, the 3.15-million-ha Lake Baikal is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve.
The Dragon's Breath cave is the largest non subglacial lake in the world. It was discovered in 1986 by the South African Speleological Association. Vostok Lake of Antarctica is the largest subglacial lake in the world.
Lake Kariba is the world's largest artificial lake and reservoir by volume. It lies 1,300 kilometres (810 mi) upstream from the Indian Ocean, along the border between Zambia and Zimbabwe.