Russia: Lake Baikal

Lake Baikal is the world's deepest and oldest freshwater lake. It curves for nearly 400 miles through south-eastern Siberia, north of the Mongolian border.

More than 5000 feet deep at its most profound, with another four mile thick layer of sediment further down, the lake's cold, oxygen-rich waters teem with bizarre life-forms.

Postcrossing Forum - September 50 RR
Source: http://lakebaikal.org/
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