Darwin Nature Reserve, Darvinsky Zapovednik (Russian: Дарвинский заповедник) is a nature reserve (a zapovednik) in the north of Russia, located in Cherepovetsky District of Vologda Oblast and Breytovsky District of Yaroslavl Oblast, on the shores of the Rybinsk Reservoir of the Volga River. It was established July 18, 1945 to study the effects of raising freshwater level on the environment. It was named after Charles Darwin.