Lake Pyaozero is a large freshwater lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Republic of Karelia

Republic of Karelia

The Republic of Karelia is a federal subject of Russia .-Geography:The republic is located in the northwestern part of Russia, taking intervening position between the basins of White and Baltic seas...

, northwestern part of Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

. It is located at 66.0833333°N 30.9666667°E and has an area of 659 km². There are many islands on the lake with total area of 186 km². Among the rivers that flow into lake Pyaozero is the river Oulankajoki

Oulankajoki

Oulankajoki is a river of Finland and Russia. It is part of the Kovda River system in Finland, in the Republic of Karelia and in the Murmansk Oblast in Russia. From the Kovda River the waters flow into the Lake Pyaozero in the Republic of Karelia in Russia and from there to the White Sea.-See...

 that begins in Finland, where one of its tributaries is the river Kitkanjoki

Kitkanjoki

Kitkanjoki is a river of Finland. It begins from the lake Ala-Kitka that is connected to the lake Yli-Kitka in the municipalities of Posio and Kuusamo in the province of Northern Ostrobothnia and flows then towards Russia joining the river Oulankajoki near the Russian border. It is a part of the...

 that begins from lake Kitkajärvi

Yli-Kitka

Yli-Kitka is a lake in Finland, in the municipalities of Kuusamo and Posio. The lake is connected to Ala-Kitka at Kilkilösalmi strait. Yli-Kitka combined with Ala-Kitka is the largest unregulated lake in Finland. Riisitunturi National Park is located north of the lake...

 in Finland. From south also the waters of Lake Topozero

Lake Topozero

Lake Topozero is a large freshwater lake in the Republic of Karelia, northwestern part of Russia. It is located at around and has an area of 986 km², it's 75.3 km long and 30.3 km wide. Maximum depth is about 50 m. There are more than 100 islands on the lake. Topozero is used for...

in the Republic of Karelia flow into the Lake Pyaozero.