• Oakland
  • Ansai Area

Oakland is the largest city and the county seat of Alameda County, California, United States. A major West Coast port, Oakland is the largest city in the East Bay region of the San Francisco Bay Area, the third largest city overall in the Bay Area and the eighth most populated city in California. With a population of 440,646 in 2020, it serves as the Bay Area's trade center and economic engine: the Port of Oakland is the busiest port in Northern California, and the fifth busiest in the United States of America. An act to incorporate the city was passed on May 4, 1852, and incorporation was later approved on March 25, 1854. Oakland is a charter city.

Oakland's territory covers what was once a mosaic of California coastal terrace prairie, oak woodland, and north coastal scrub. In the late 18th century, it became part of a large rancho grant in the colony of New Spain. Its land served as a resource when its hillside oak and redwood timber were logged to build San Francisco. The fertile flatland soils helped it become a prolific agricultural region. In the late 1860s, Oakland was selected as the western terminal of the Transcontinental Railroad. Following the 1906 San Francisco earthquake, many San Francisco citizens moved to Oakland, enlarging the population, increasing its housing stock, and improving its infrastructure. It continued to grow in the 20th century with its busy port, shipyards, and a thriving automobile manufacturing industry.

Ansai District, which belongs to Yan'an City, Shaanxi Province, is located in the hinterland of the inland Loess Plateau, the edge of Ordos Basin, in the north of Shaanxi Province, due north of Yan'an City, west of Zhidan County, Jingbian County of Yulin City in the north, Zichang County in the east, and Ganquan County and Baota District in the south. Between longitude 108 °5 "44"-109 °26 "18" east and latitude 36 °30 °45 "- 37 °19" 3 "north. The distance between the north and south lines is 92 kilometers, and the east-west distance is 36 kilometers, with a total area of 2950 square kilometers, accounting for 8.04 percent of the total area of Yan'an. Ansai has been known as the "upper county throat" since ancient times. It is located in the cultural fusion zone in which the national culture of the Central Plains represented by Yangshao culture develops northward and the northern national culture represented by Yinshan rock painting culture develops to the south.
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