Ice ice baby
At least 25 million years old, Lake #Baikal is the oldest lake in the world. It and the surrounding mountains were formed by the Earth's crust fracturing and moving. .
Indigenous communities have lived around Lake Baikal since at least the sixth century B.C., though they visited long before that. It was the site of a battle in the Han-Xiongu War (133 B.C. to A.D. 89). Local legend holds that Jesus visited Lake Baikal, according to @Smithsonianmagazine. .
Lake Baikal is the largest freshwater lake in the world (by volume) and the world's deepest lake.