Seliger (Russian: Селигер) is a lake in Tver Oblast and, in the extreme northern part, Novgorod Oblast of Russia, in the northwest of the Valdai Hills, a part of the Volga basin. Absolute height: 205 m, area 212 km², average depth 5.8 m.
Seliger is a large system of lakes linked by effluents, has many small islands and is surrounded by forests, including pine woods with many berries and mushrooms.
Seliger is situated within a picturesque landscape of forests and hills. The lake is a protected nature reserve and is sometimes known as the "European Baikal" due to the diversity of its unique flora and fauna, similar to Lake Baikal.