Treaty of Saint Petersburg

The Treaty of Saint Petersburg (樺太・千島交換条約 Karafuto-Chishima Kōkan Jōyaku) (Russian:Петербургский договор) between the Empire of Japan and Empire of Russia was signed on 7 May 1875, and its ratifications exchanged at Tokyo on 22 August 1875.

Its terms stipulated that Russia cedes to Japan the part of Sakhalin island it then owned in exchange for the group of the Kuril Islands owned by Japan. Consequently, Sakhalin island (Karafuto) as a whole became Japanese territory, and the entire Kuril archipelago Russian territory.