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 (65.66°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 rafting.