• Sacramento
  • ngapa  county (in tibetan )

Sacramento (/ˌsækrəˈmɛntoʊ/ SAK-rə-MEN-toh; Spanish: [sakɾaˈmento], Spanish for ''sacrament'') is the capital city of the U.S. state of California and the seat and largest city of Sacramento County. Located at the confluence of the Sacramento and American River in Northern California's Sacramento Valley, Sacramento's 2020 population of 524,943 makes it the sixth-largest city in California and the ninth-largest capital in the United States. Sacramento is the seat of the California Legislature and the Governor of California, making it the state's political center and a hub for lobbying and think tanks. It features the California State Capitol Museum.

Sacramento is also the cultural and economic core of the Greater Sacramento area, which at the 2020 census had a population of 2,680,831, the fourth-largest metropolitan area in California.

Before the arrival of the Spanish, the area was inhabited by the historic Nisenan, Maidu, and other indigenous peoples of California. Spanish cavalryman Gabriel Moraga surveyed and named the Río del Santísimo Sacramento (Sacramento River) in 1808, after the Blessed Sacrament. In 1839, Juan Bautista Alvarado, Mexican governor of Alta California, granted the responsibility of colonizing the Sacramento Valley to Swiss-born Mexican citizen John Augustus Sutter, who subsequently established Sutter's Fort and the settlement at the Rancho Nueva Helvetia. Following the American Conquest of California and the 1848 Treaty of Guadalupe-Hidalgo, the waterfront developed by Sutter began to be developed, and incorporated in 1850 as the City of Sacramento.

Aba County is located on the southeast edge of the Qinghai-Tibet Plateau, at the confluence of Sichuan, Gansu and Qinghai provinces, bordering Ruoergai County, Hongyuan County, Malkang County, Rangtang County and Maqu County of Gansu Province, Jiuzhi County of Qinghai Province, and Banma County. It is an important transportation hub from the mainland to the northwest, an important trade center and material distribution center, and a county dominated by animal husbandry with both agriculture, animal husbandry and forestry. it is a typical old, small, border, poor and sick area. The topography of the county is complex, the terrain gradually inclines from northwest to southeast, the county seat is 3290 meters above sea level, the highest elevation is 5154 meters above sea level, and the lowest elevation is 2936 meters above sea level. The runoff belongs to the Yangtze River and Yellow River systems, belongs to the semi-humid monsoon climate in the cold temperate zone of the plateau, and there is no obvious difference between the four seasons, the temperature difference between day and night is large, the frost-free period is short, the solar radiation is strong, and the average annual temperature is 4 ℃. Aba County in 1951
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