Lake Topozero (Russian: Топозеро, Finnish: Tuoppajärvi) is a large freshwater lake in the Republic of Karelia, northwestern part of Russia. It is located at around 65°40′N 32°00′E / 65.66°N 32°E 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 fishery and timber floating. From Lake Topozero the waters flow north into the Lake Pyaozero and from there to the White Sea through the Kovda River.