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In northwestern Montana, USA. The water is so transparent that it seems that this is a quite shallow lake. In fact, it’s very deep.

"This is Flathead Lake in northwestern Montana, USA. The water is so transparent that it seems that this is a quite shallow lake. In fact, it is 370.7 feet deep." "It is one of the cleanest in the populated world for its size and type. Its known maximum depth is 370.7 ft (113.0 m),[1] making it deeper than the average depths of the Yellow Sea or the Persian Gulf."

from Mail Online

Incredible photographs show a school of fish forming a 'tornado'

William Winrame captured the incredible moment a school of fish swarmed around him and other divers and formed a vortex (above)