Northwestern China (西北, Xīběi) includes the autonomous regions of Xinjiang and Ningxia and the provinces of Shaanxi, Gansu, and Qinghai.
Outer Northwest China (Chinese: 外西北; pinyin: Wài Xīběi) is the territories that were ceded from Qing China to the Russian Empire in the Convention of Peking, Sino-Russian North West Frontier Treaty, Treaty of Saint Petersburg (1881) and other Unequal Treaties. The territories are former parts of far western Xinjiang and northwestern Outer Mongolia and all of Tannu Uriankhai. Historically, Outer Northwest China was part of Dzungaria but was obtained by the Manchus after their defeat of the Dzungars in the 18th century.
Following the dissolution of the Soviet Union, the territories were separated and are now governed by four successors of the Soviet Union: Kazakhstan, Kyrgyzstan, Tajikistan and Russia.
Coordinates: 36°48′00″N 95°48′00″E / 36.8000°N 95.8000°E