• Tulsa
  • Tianshui,Tienshui

Tulsa (/ˈtʌlsə/) is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with 1,023,988 residents. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, with urban development extending into Osage, Rogers, and Wagoner counties.

Tulsa was settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe and most of Tulsa is still part of the territory of the Muscogee (Creek) Nation.[a]

Historically, a robust energy sector fueled Tulsa's economy; however, today the city has diversified and leading sectors include finance, aviation, telecommunications and technology. Two institutions of higher education within the city have sports teams at the NCAA Division I level: Oral Roberts University and the University of Tulsa. As well, the University of Oklahoma has a secondary campus at the Tulsa Schusterman Center, and Oklahoma State University has a secondary campus located in downtown Tulsa. For most of the 20th century, the city held the nickname "Oil Capital of the World" and played a major role as one of the most important hubs for the American oil industry.

Tianshui, a prefecture-level city under the jurisdiction of Gansu Province, is located in the southeast of Gansu Province, adjacent to Guanzhong Plain. It is an important node city of Guanzhong Plain Urban agglomeration and the sub-core city of Guanzhong-Tianshui Economic Zone. Tianshui, once known as Shangli, Chengji and Qinzhou, is said to be the birthplace of Fuxi and Nu WA, one of the important birthplaces of Chinese civilization, known as "the hometown of Emperor Xi". Tianshui has jurisdiction over 2 districts and 5 counties, with a total area of 14325 square kilometers and a total population of 3.829 million, including 3.3549 million permanent residents (2018). Tianshui is high in the northwest and low in the southeast, with an elevation of 1000-2100 meters above sea level. The climate is temperate monsoon climate. Tianshui is a famous historical and cultural city in China, an excellent tourist city in China, and one of China's old industrial bases. It has national and provincial enterprise technology centers and engineering.
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