Lake Baikal is located in southern Siberia. Lake Baikal is the largest freshwater lake by volume in the world, containing roughly 20% of the world's unfrozen surface fresh water. With a maximum depth of 5,387 feet, Baikal is the world's deepest lake. It is considered among the world's clearest lakes and is considered the world's oldest lake at 25 million years. It is the seventh-largest lake in the world by surface area. With 23,615.39 km3 of fresh water, it contains more water than all the North American Great Lakes combined.