• Oakland
  • Longjing

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.

Longjing City belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Located in the east of Jilin Province, the southeast of Yanbian Korean Autonomous Prefecture and the eastern foot of Changbai Mountain, it is the forefront of Changji map development and opening up pilot area, an important part of the international cooperation of Tumen River region and the integration of Yanlong map. It is located in the southeast of Jilin Province, at the eastern foot of Changbai Mountain. The geographical coordinates are between 128 °54 °E and 129 °48'E and 42 °21 °N and 43 °24'N. Facing North Korea across the Tumen River in the southeast, the border is 142.5 kilometers long, bordering Yanji City and Tumen City in the northeast, Helong City in the southwest, and Antu County in the northwest. In 2015, Longjing City achieved a GDP of 4.03 billion yuan. As of 2014, Longjing had jurisdiction over 5 towns, 2 townships and 2 streets.
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