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In Russian, the entire island was named "Sakhalin" or "Saghalien". It is from Manchu "sahaliyan ula angga hada", meaning "peak of the mouth of Amur River". The southern part was simply called "Yuzhny Sakhalin" ("South Sakhalin"). In Korean, the name is "Sahallin" or "Hwataedo", with the latter name in use during Korea under Japanese rule.