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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.

Chengguan District, which belongs to Lanzhou City, Gansu Province, is located in the central and eastern part of Gansu Province, between longitude 103 °46km east and latitude 35 °58km. It is 20.02 km long from east to west, 22.6 km wide from north to south and covers an area of 220 square km. Chengguan District is the central area of Lanzhou, the capital of Gansu Province, where the party, government and military organs are stationed, and the political, economic, scientific, technological and cultural center of the province. The geomorphology is characterized by the crossing of the Yellow River between the north and south mountains. The Yellow River enters the Yellow River Estuary from the Leitan River, and Gaolan Mountain and Baita Mountain face each other from the north to the south. Chengguan District is a mid-temperate semi-arid zone, the average elevation in the urban area is 1520 meters, the highest peak is Yingpanling in the southeast of Gaolan Mountain, 2171 meters above sea level, and the lowest is the north beach of Yantan, 1503 meters above sea level. The annual average temperature is 1.
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