• Oakland
  • Sanyuan

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.

Sanyuan County, Xianyang City, Shaanxi Province, is known as "Jiayi" in history and "Chiyang" in ancient times, which is located in the middle of Guanzhong Plain in Shaanxi Province. It is named after Xiyuan (also known as Qiliyuan), Central Plains (also known as Xinxingyuan) and Dongyuan (also known as Lingqian Yuan). Sanyuan is the ancient capital city, since the Northern Wei Taiping Zhenjun seven years (AD 446) home county, has a history of more than 1570 years, known as "food and clothing capital, hundreds of millions of mouth" reputation. County area of 576.9 square kilometers, commonly used arable land area of 491265 mu, jurisdiction 1 street office 9 towns 4 centers 172 administrative villages, the county's registered population of 408165 (2018). Sanyuan is located in the arc center of Xi'an, Xianyang, Weinan, Tongchuan and other surrounding large and medium-sized cities, connected with Lintong, Fuping and Yanliang in the east, Gaoling in the south and Jingyang and Chun in the west.
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