A Sink-hole is a Depression or hole in the ground caused by some form of Collapse of the surface layer. They vary in size from 1 to 600 m (3.3 to 2,000 ft) both in diameter and depth. They may form gradually or suddenly, and are found Worldwide.
The Sink-Holes near the Dead Sea, are formed when underground salt is dissolved by fresh water intrusion, due to continuing Sea-Level drop.
Otjikoto Lake is the smaller of only two permanent natural lakes in Namibia. The diameter of the Lake is 102 m (335 ft); its depth is undetermined. The Lake tapers into a lateral Cave System making it impossible to determine its exact depth estimated in 142 meters.
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