The deepest, oldest lake on Earth
Lake Baikal is a rift lake in southern Siberia, Russia, between Irkutsk Oblast and the Republic of Buryatia. It is about 636 kilometers long, up to 79 kilometers wide and reaches a maximum depth of 1,642 meters, which makes it the deepest lake in the world. Its surface area is about 31,722 square kilometers.
Because it is so deep, Baikal is also the largest freshwater lake by volume. Wikipedia puts its water at roughly 22 to 23 percent of the world's fresh surface water. The lake is estimated to be 25 to 30 million years old, which makes it the oldest lake in geological history, and UNESCO named it a World Heritage Site in 1996.
From early January to May or June the surface freezes. The ice is usually between 0.5 and 1.4 meters thick, and in winter the water below is so clear that visibility in open sections can reach 30 to 40 meters. That is why photos of Baikal ice look like cracked glass.
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