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oblast (province), far eastern Russia. It occupies the basins of the middle Amur River and its tributary the Zeya and extends up to the crest of the Stanovoy Range. In 1689 Russia yielded the Amur region to China by the Treaty of Nerchinsk, but Russian Cossacks reincorporated it in the latter part of the 19th century. Amur oblast was formed in 1932 from Khabarovsk kray (region), and its present boundaries were established in 1948