Lake Baikal, lake located in the southern part of eastern Siberia in Russia. It is the oldest existing freshwater lake on Earth (20 million-25 million years old), as well as the deepest continental body of water, having a maximum depth of 5,315 feet (1,620 meters).
It is the deepest, oldest and largest freshwater lake by volume, containing one fifth of the world’s fresh water. The 25-million old lake has a maximum depth of 1,642 meters and is a living museum, boasting approximately 1,700 animal and plant species, out of which two thirds are endemic.