What is the name of the world's deepest lake, located in Siberia?

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Lake Baikal is the world’s deepest lake, located in Siberia, Russia.

Lake Baikal reaches a maximum depth of about 1,642 metres, making it the deepest lake on Earth. It is also the world’s oldest freshwater lake, with an estimated age of roughly 25 million years, and it contains about 20 percent of the planet’s unfrozen surface freshwater.

The lake occupies a long, narrow rift valley in southern Siberia. Tectonic forces continue to shape the basin, which helps explain its exceptional depth and geological age. Baikal is about 636 kilometres long and is surrounded by mountains, forests, and taiga landscapes.

Its isolated waters support a remarkable number of endemic species. The Baikal seal, or nerpa, is the only seal species living exclusively in freshwater. The lake’s famous endemic fish include omul and golomyanka. Lake Tanganyika is also extremely deep, but its maximum depth is about 1,470 metres, so it does not surpass Baikal.

Source: Wikipedia · fact-checked Sept. 2026

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