• Oakland
  • Tumen

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.

Tumen City is located in the east of Jilin Province, the eastern foot of Changbai Mountains and the lower reaches of the Tumen River, facing Wancheng County in North Korea, Hunchun City in the east, Yanji City in the west, Longjing City in the south and Wangqing County in the north. As of 2007, Tumen City has jurisdiction over 3 streets and 4 towns, with a total area of 1142.65 square kilometers. By the end of 2011, the total population of Tumen City was 126606. It is a multi-ethnic city dominated by the Korean nationality. The three lines of road, railway and shipping in Tumen City are all located in the "Golden Triangle" of Northeast Asia, which is an international transportation hub connecting the hinterland of Northeast China, North Korea and the Russian far East. On December 29, 2018, the sixth national unity and progress demonstration zone was named by the State ethnic Affairs Commission.
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