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 a term used to describe the territories ceded from Qing China to 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 northern Outer Mongolia. 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 are separated and governed by four successors of Soviet Union: Kazakhstan, Kyrgyzstan, Tajikistan and Russia.

China (ⁱ/ˈtʃaɪnə/; Chinese: 中国; pinyin: Zhōngguó; see also Names of China), officially the People's Republic of China (PRC), is the world's most-populous country, with a population of over 1.3 billion. Covering approximately 9.6 million square kilometres, the East Asian state is the world's second-largest country by land area, and the third- or fourth-largest in total area, depending on the definition of total area.

The People's Republic of China is a single-party state governed by the Communist Party of China. It exercises jurisdiction over 22 provinces, five autonomous regions, four directly controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau). Its capital city is Beijing. The PRC also claims Taiwan—which is controlled by the Republic of China (ROC), a separate political entity—as its 23rd province, a claim controversial due to the complex political status of Taiwan and the unresolved Chinese Civil War. The PRC government denies the legitimacy of the ROC.

The Uyghurs (Uyghur: ئۇيغۇر‎, ULY: Uyghur; [ʔʊjˈʁʊː]; simplified Chinese: 维吾尔; traditional Chinese: 維吾爾; pinyin: Wéiwú'ěr) are a Turkic ethnic group living in Eastern and Central Asia. Today, Uyghurs live primarily in the Xinjiang Uyghur Autonomous Region in the People's Republic of China. An estimated 80% of Xinjiang's Uyghurs live in the southwestern portion of the region, the Tarim Basin.

The largest community of Uyghurs outside Xinjiang in China is in Taoyuan County, in south-central Hunan province. Outside of China, significant diasporic communities of Uyghurs exist in the Central Asian countries of Kazakhstan, Kyrgyzstan, and Uzbekistan. Smaller communities are found in Afghanistan, Pakistan, and Turkey.

Uyghur is often pronounced /ˈwiːɡər/ by English speakers, though the most acceptable English pronunciation is ooy-goor. Several alternate romanizations also appear: Uighur, Uygur and Uigur. The Xinjiang Uyghur Autonomous Region provincial government recommends that the generic ethnonym [ʔʊjˈʁʊː], adopted in the early 20th century for this Turkic people, be transcribed as "Uyghur".