Lake Segozero (Russian: Сегозеро, Finnish: Seesjärvi) is a large freshwater lake in the Republic of Karelia, northwestern part of Russia.

The Segezha is a major outflow from Segozero and it empties to Vygozero.

After the hydroelectric power plant was built on Segezha River the surface area of Segozero have risen from 815 km² to 906 km².

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