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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.

Chang'an District, Xi'an City, Shaanxi Province is located in the hinterland of Guanzhong Plain, south by Qinling Mountains, surrounded by Xi'an from the west and south, with mountains, rivers and plateaus, with a total area of 1580 square kilometers and 25 subdistrict offices. The resident population of the region is 1.130213 million (2019) and the registered permanent population is 1.083 million (2016). Changan District has a superior location and convenient transportation, and the Weiqu residence of the district government is only 8.7 kilometers away from the clock tower in the core of Xi'an. Ancient Chang'an was once the capital of 13 dynasties, including Zhou, Qin, Han and Tang dynasties. There are ten sites including the Fenghao site of the Zhou Dynasty, the Afang Palace of the Qin Dynasty, and eight famous mountains, including Cuihua Mountain, Wutai Mountain, Xiangyu Mountain and Qinghua Mountain. There are 42 monasteries, including Xingjiao Temple, Huayan Temple, Xiangji Temple, and the ten major sects of Buddhism, including Fa Xiangzong, Pure Land sect and Huayan Temple.
Airport In Chang'an District - Shijiazhuang Zhengding International Airport
Shijiazhuang Zhengding International Airport (IATA: SJW, ICAO: ZBSJ), located in the northeast of Zhengding County, Shijiazhuang City, Hebei Province, China, is 32 kilometers away from the urban area. Important air gateway, alternate airport of Beijing Capital Airport, regional aviation hub   , An important international air cargo transit base in northern China.  
Shijiazhuang Zhengding International Airport officially opened on February 18, 1995. In March 1996, Shijiazhuang Air Port was officially opened to the outside world. In July 2008, Shijiazhuang Zhengding Airport was renamed "Shijiazhuang Zhengding International Airport". The total length of the airport runway is 3,400 meters. There are two terminal buildings, No. 1 and No. 2, with a total area of ​​209,000 square meters.  
In 2020, Shijiazhuang Zhengding International Airport will handle 8.203 million passengers, a year-on-year decrease of 31.2%; cargo and mail throughput will be 86,390.4 tons, a year-on-year increase of 62.3%; aircraft movements will be 76,800, a year-on-year decrease of 1.4%.  
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