World's oldest lake (Martin Moos_Lonely Planet)

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Russia's Lake Baikal in southern Siberia is an impressive 25 million years old and with an average depth of 1,700 metres, it's also the world's deepest lake. In fact, it's so huge locals call it the 'sea' - it contains almost a quarter of the world's freshwater - and part of the Trans-Siberian railway loops around it.

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