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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.

Pingan District is one of the two municipal districts of Haidong City, Qinghai Province. Pingan County, named after Ping an Station in 1979, was changed to Pingan District in February 2015. It was the capital of Haidong District from 1979 to 2013. After Haidong was relocated and established in 2013, it is still the temporary residence of Haidong City. Ping'an District is located in the east of Qinghai Province, in the hinterland of Haidong city center, at 101 °49km east longitude and 36 °15 north latitude & #39;, faces Ledu District of Haidong City in the east, Xining City and Huangzhong County in the west, Hualong County in the south and Huazhu County in the north. By 2014, it had jurisdiction over 3 towns and 5 ethnic townships, with a total area of 769 square kilometers and a total population of 127515, mainly Han nationality, as well as 17 ethnic minorities, including Hui, Tibetan and Turkish. 2013, Ping
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