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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.

Dingan County is located in the central northeast of Hainan Island, longitude 110o 7km east, latitude 19 °13km, north latitude 19 °13km, Wenchang City to the east, Chengmai County to the west, Qionghai City to the southeast, Tunchang County to the southwest, across the river to the north and Qiongshan District of Haikou City to the north, 45.50km from east to west, 68km from north to south, 251.50 km from north to south, and 251.50 km from north to south. The population of the county is 310000, covering an area of 1189 square kilometers. Ding'an County has the geographical location of facing the air and the sea, and has the advantages of developing tropical high-efficiency agriculture, high-tech industry, warehousing industry, commercial and residential industry and trade projects. It is the birthplace of Qiong Opera and has a large number of celebrities. Known as the folk spread of "no stable opera troupe", known as Hainan's "hometown of Qiongju Opera", it was awarded by the Ministry of Culture in November 2011.
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