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Photo: Peter1936F · CC BY-SA 4.0 · Wikimedia Commons
Lake in Croatia
Red Lake is a sinkhole containing a karst lake near the city of Imotski, Croatia. It is known for its numerous caves and high cliffs, reaching over 241 metres (791 ft) above normal water level and continuing below the water level. The total explored depth of this sinkhole is approximately 530 metres (1,740 ft) with a volume of roughly 25–30 million cubic metres, thus it is the third largest sinkhole in the world, and the deepest known case of a collapse doline containing a lake. Water drains out of the basin through underground waterways that descend below the level of the lake floor. The deepest known point of the lake is 4 metres (13 ft) below sea level.
