間宮海峡
Nivkh lands extended along the northern coast of Manchuria from the Russian fortress at Tugur Bay eastward to the mouth of the Amur River at Nikolayevsk, then south through the Strait of Tartary as far as De Castries Bay. Formerly their territories had extended westwards at least as far as the Uda river and the Shantar Islands until pushed out by the Manchus and, later, the Russians.