Lake, southeastern Finland.
Located near the border with Russia, Lake Pielinen is 56 mi (90 km) long and has an area of 422 sq mi (1,093 sq km). The lake has many islands and is drained southward into Lake Saimaa by the Pielis River. It is surrounded by dense forests, especially on its western shore. The shore is capped by Koli hill, the centre of a winter sports area.