• Oakland
  • Shuangyashan

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.

Shuangyashan City is a prefecture-level city in Heilongjiang Province. Shuangyashan City is located in the northeast of Heilongjiang Province, with high terrain in the southwest and low in the northeast, and is located in the humid climate zone of the middle temperate zone. It has jurisdiction over 4 districts and 4 counties, with a total area of 22483 square kilometers and a total population of 1.423 million in 2017. Within 300 kilometers of Shuangyashan, there are Tongjiang, Fuyuan and other first-class ports to Russia, which are located in the core area where Heilongjiang Province opens to the Russian far East, and is an important node city for the construction of the "China-Mongolia-Russia Economic Corridor." It has a first-class national port-Raohe Port, the Raohe Sino-Russian Exchange Trade Zone and the Sida Sino-Russian International Trade Center have been put into operation, and the Sino-Russian International Cultural Logistics Economic and Trade Industrial Park is being constructed. to build an import and export processing base for Russia and a national trade distribution base for Russia. Successively opened Shuangyashan to Haba.
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