Xihai Jun is a prefecture of ancient China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 located in Qingzang Plateau. Xi means west, Hai means sea, and Jun is a kind of administrative unit above county in ancient China and may be translated as prefecture or province.

Xihai Jun or Xihai Prefecture was first established in the 4th year of Yuanshi (元始四年, AD 4) in Han Dynasty

Han Dynasty

The Han Dynasty was the second imperial dynasty of China, preceded by the Qin Dynasty and succeeded by the Three Kingdoms . It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty of the former regent Wang Mang...

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The site of the Longqi (龍耆), the capital city of Xihai Jun in Han Dynasty, is located on the south bank of Huangshui River (湟水), near Qinghai Lake

Qinghai Lake

Qinghai Lake , is a saline lake situated in the province of Qinghai, and is the largest lake in China. The names Qinghai and Kokonor both mean "Blue/Teal Sea/Lake" in Chinese and Mongolian. It is located about west of the provincial capital of Xining at 3,205 m above sea level in a depression...

. Today, it is called Sanjiao Cheng (三角城, Delta City). It is near the county town of Haiyan County (海晏縣) and 90 kilometers west to Xining

Xining

Xining is the capital of Qinghai province, People's Republic of China, and the largest city on the Tibetan Plateau. It has 2,208,708 inhabitants at the 2010 census whom 1,198,304 live in the built up area made of 4 urban districts.-History:...

 City, the capital city Qinghai

Qinghai

Qinghai ; Oirat Mongolian: ; ; Salar:) is a province of the People's Republic of China, named after Qinghai Lake...

 province.

In the 23rd year of Zhenguan (貞觀二十三年，AD 649), King of Xihai Jun　(西海郡王) was conferred upon Songtsen Gampo

Songtsen Gampo

Songtsän Gampo Songtsän Gampo Songtsän Gampo (Tibetan: སྲོང་བཙན་སྒམ་པོ་, Wylie: Srong-btsan sGam-po, 569–649?/605–649? was the founder of the Tibetan Empire (Tibetan: Bod; ), by tradition held to be the thirty-third ruler in his dynasty. In the Chinese records, his name is given as 'Sōngzàngānbù'...

 (松贊幹布), the King of Tubo (吐蕃, or Tibet

Tibet

Tibet is a plateau region in Asia, north-east of the Himalayas. It is the traditional homeland of the Tibetan people as well as some other ethnic groups such as Monpas, Qiang, and Lhobas, and is now also inhabited by considerable numbers of Han and Hui people...

), by Tang Gaozong (唐高宗), the emperor of Tang Dynasty

Tang Dynasty

The Tang Dynasty was an imperial dynasty of China preceded by the Sui Dynasty and followed by the Five Dynasties and Ten Kingdoms Period. It was founded by the Li family, who seized power during the decline and collapse of the Sui Empire...

.