Haixi Mongolian and Tibetan Autonomous Prefecture (Chinese: 海西蒙古族藏族自治州; Mongolian: ᠬᠠᠶᠢᠰᠢ ᠶᠢᠨ ᠮᠣᠩᠭᠣᠯ ᠲᠥᠪᠡᠳ ᠦᠨᠳᠦᠰᠦᠲᠡᠨ ᠦ ᠥᠪᠡᠷᠲᠡᠭᠡᠨ ᠵᠠᠰᠠᠬᠤ ᠵᠧᠦ; Tibetan: མཚོ་ནུབ་སོག་རིགས་ཆ་བོད་རིགས་རང་སྐྱོང་ཁུལ་), locally also known as Qaidam Prefecture (Mongolian: ᠴᠠᠢᠳᠠᠮ; Tibetan: ཚྭ་འདམ་; Chinese: 柴达木), is an autonomous prefecture occupying much of the northern half of (as well as part of the southwest of) Qinghai Province, China. It has an area of 325,785 square kilometres (125,786 sq mi) and its seat is Delingha. The name of the prefecture literally means "west of (Qinghai) Lake."

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Haixi Prefecture 海西州 · ᠬᠠᠶᠢᠰᠢ ‍ᠶᠢᠨ ᠵᠧᠦ · མཚོ་ནུབ་ཁུལ།
Autonomous prefecture
Haixi Mongolian and Tibetan Autonomous Prefecture 海西蒙古族藏族自治州 ᠬᠠᠶᠢᠰᠢ ᠶᠢᠨ ᠮᠣᠩᠭᠣᠯ ᠲᠥᠪᠡᠳ ᠦᠨᠳᠦᠰᠦᠲᠡᠨ ᠦ ᠥᠪᠡᠷᠲᠡᠭᠡᠨ ᠵᠠᠰᠠᠬᠤ ᠵᠧᠦ མཚོ་ནུབ་སོག་རིགས་ཆ་བོད་རིགས་རང་སྐྱོང་ཁུལ་
Tanggula Mountains
Location of Haixi Prefecture in Qinghai
Coordinates (Haixi Prefecture government): 37.38°N 97.37°E / 37.38; 97.37
Country	China
Province	Qinghai
Prefectural seat	Delingha
Area
• Total	325,785 km2 (125,786 sq mi)
Population  (2017)[1]
• Total	515,200
• Density	1.6/km2 (4.1/sq mi)
• Major Ethnic Groups	Han−66.01% Hui−13.45% Tibetan−10.93% Mongolians−5.53%
GDP[2]
• Total	CN¥ 50 billion US$ 7 billion
• Per capita	CN¥ 86,713 US$ 13,922
Time zone	UTC+8 (China Standard)
Postal code	817000
Area code	0977
ISO 3166 code	CN-QH-28
Website	www.haixi.gov.cn

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Geladandong Mountain, the source of the Yangtze River, is located here.

After 1949, the People's Government of Dulan County was founded and the area was renamed Dulan Autonomous District (都兰自治区); in 1954, Dulan was renamed Haixi Mongol, Tibetan and Kazakh Autonomous District (海西蒙藏哈萨克族自治区) and in 1955, Haixi Mongol, Tibetan and Kazakh Autonomous Prefecture (海西蒙藏哈萨克族自治州). In 1963, it was renamed "海西蒙古族藏族哈萨克族自治州" (with the "Tibetan" added to the official county name). In 1985, after the Kazakhs had returned to Xinjiang, it was again renamed to Haixi Mongol and Tibetan Autonomous Prefecture.^[3]

As of the 2017 census, Haixi had 515,200 inhabitants.

The following is a composition of ethnic groups in the prefecture, taken in the 2010 Census.

Haixi directly governs 3 county-level cities and 3 counties.

• The southwestern exclave of the Haixi Prefecture, separated from the rest of the prefecture by a "panhandle" of the Yushu Tibetan Autonomous Prefecture, is the Tanggula Town of Golmud City.

• Delingha City
• Qaidam Basin
• Geladandong mountain
• Headwaters of the Yangtze River
• The Baigong Pipes