Lake Baikal Contains One-Fifth of Earth's Unfrozen Freshwater

Lake Baikal in Siberia is the world's largest freshwater lake by volume, containing about one-fifth of all unfrozen fresh water on Earth's surface. It is also the deepest continental body of water, with a maximum depth of 5,315 feet. The lake is estimated to be 20-25 million years old, making it the oldest existing freshwater lake on Earth.