Olenek əlyĭnyôkˈ [key], river, c.1,350 mi (2,200 km) long, rising in the central Siberian plateau, Krasnoyarsk Territory, E Siberian Russia. It winds E then N through NW Sakha Republic to the Laptev Sea. It is navigable for c.600 mi (970 km) upstream and abounds in fish.

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