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Portland (/ˈpɔːrtlənd/, PORT-lənd) is a port city in the Pacific Northwest and the largest city in the U.S. state of Oregon. Situated at the confluence of the Willamette and Columbia rivers, Portland is the county seat of Multnomah County, the most populous county in Oregon. As of 2020, Portland had a population of 652,503, making it the 26th-most populated city in the United States, the sixth-most populous on the West Coast, and the second-most populous in the Pacific Northwest, after Seattle. Approximately 2.5 million people live in the Portland metropolitan statistical area (MSA), making it the 25th most populous in the United States. About half of Oregon's population resides within the Portland metropolitan area.

Named after Portland, Maine, the Oregon settlement began to be populated in the 1840s, near the end of the Oregon Trail. Its water access provided convenient transportation of goods, and the timber industry was a major force in the city's early economy. At the turn of the 20th century, the city had a reputation as one of the most dangerous port cities in the world, a hub for organized crime and racketeering. After the city's economy experienced an industrial boom during World War II, its hard-edged reputation began to dissipate. Beginning in the 1960s, Portland became noted for its growing liberal and progressive political values, earning it a reputation as a bastion of counter-culture.

Tongde County is located in the southeast of Qinghai Province, at the junction of Hainan, Huangnan and Guoluo Tibetan Autonomous Prefecture, and belongs to the people's Government of Hainan Prefecture. The Xijiu Highway, the provincial highway, runs through the whole territory from north to south, and the Yellow River surrounds the county in a half-ring from east to west. The county seat is located 3060 meters above sea level, 256km away from the state capital Chabqa town and 282km away from the provincial capital Xining, with a resident population of about 9000. The climate is typical plateau continental climate, the highest elevation in the county is 4671 meters, the lowest elevation is 2648 meters, the average elevation is 3660 meters, the average annual temperature is 0.4 ℃-0.6 ℃, the average annual precipitation is 440mm, and there is no absolute frost-free period. The county has a total area of 4758 square kilometers and has jurisdiction over 73 administrative villages in 2 towns and 3 townships. In 2009, the total population was 61000.
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