Lake Baikal

Lake Baikal
Also known as the "blue eye of Siberia", Lake Baikal is located in Southern Siberia the Russo-Mongolian border. Famous for being the deepest lake in the world with a maximum depth of 5,369 feet, it holds a volume of water larger than that of all the great lakes combined.
Lake Baikal is a great eco-system where more than 1,700 species of flora and fauna live; two thirds of them only to be found here. Completely surrounded by steep mountains and dense forests, the lake has an estimated age of 25-30 million years, making it one of the most ancient lakes in geological history.
However, this enormous water formation may harbor a mystery of immense proportions: a gigantic animal, either of sturgeon-like appearance or a rogue sea serpent; Baikal’s very own Loch Ness Monster. No one can tell for sure if the legend is true or not, but the creature exists in people's minds and haunts their thoughts.
If you know of any other deep lakes worth exploring, please let us know in the comments.