Boesmansgat, Natural sinkhole in Northern Cape, South Africa.
Boesmansgat is a water-filled sinkhole in Northern Cape featuring a circular opening with a surface area measuring roughly 100 meters across. The entrance is covered by green duckweed and the cave system descends steeply into the earth below.
The first documented exploration of the cave took place in 1977 and sparked a series of diving expeditions to follow. Since then, the site has seen numerous underwater ventures by experienced divers.
The site maintains records of multiple diving achievements, including Nuno Gomes's 282.6-meter descent in 1996 and Karen van den Oever's 246-meter dive.
Reaching the water requires climbing down steep rock faces, so visitors should arrive with good physical fitness and sturdy footwear. The best time to explore is during dry seasons when the rocky paths are safer to traverse.
The cave system is among the deepest freshwater caves globally, plunging over 270 meters beneath the surface. The entrance itself spans roughly 20 meters wide, making it one of the largest known freshwater caverns of its kind.
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