Khatanga River delta, Siberia, Russia, satellite image. The Khatanga River flows from bottom right, north into the Laptev Sea. This region of northern Siberia experiences harsh conditions all year round. It barely thaws out in summer and experiences perpetual night and temperatures of - 45 degrees Celsius in winter. The permafrost has allowed dead animals to be preserved for tens of thousands of years; this region has the world's biggest collection of mammoth remains.
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