Peipus, Lake

Lake in eastern Estonia and western Russia; the boundary between the Baltic state and the Pskov oblast of the Russian Federation runs north–south across the centre of the lake. It covers an area of 3,555 sq km/1,373 sq mi, and its chief outlet is the Narva River, which flows north from the lake to the Gulf of Finland. The Russian hero Alexander Nevski defeated the Teutonic Knights on its frozen surface in 1242.

Lake Peipus is shallow, with an average depth of 7 m/23 ft, and a maximum depth of 15 m/49 ft. It is connected by a narrow channel with Lake Pskov to the south, in Russia.