In the Northern part of the Russian region of Bashkiria, there is a lake called Sarva. What makes it unique? Not being very large in size – 80 meters by 35 meters – it is relatively deep – maybe over 50 meter deep. Divers like this place but there is more to its uniqueness:
At around 30 meter deep this lake meets a powerful underground river.
Because of this the temperature of the water stays around same all year round just +3 to +5 degrees centigrade.
And in winter it doesn’t freeze.
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