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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.

Gansu, referred to as "Gan" or "long", is the provincial administrative region of the people's Republic of China and the capital of Lanzhou. It is located in northwest China, connecting Shaanxi to the east, Xinjiang to the west, Sichuan and Qinghai to the south, Ningxia and Inner Mongolia to the north, and Mongolia to the northwest. It is between 32 °11 miles north latitude 42 °57 miles north and 92 degrees 13 miles east longitude, covering a total area of 425800 square kilometers. The topography of Gansu is long and narrow, with complex and diverse landforms, including mountains, plateaus, flat rivers, river valleys, deserts and Gobi, surrounded by mountains and mountains, and the terrain inclines from southwest to northeast. Gansu is located in the confluence of the Loess Plateau, the Qinghai-Tibet Plateau and the Inner Mongolia Plateau. The climate types from south to north include subtropical monsoon climate, temperate monsoon climate, temperate continental arid climate and plateau.
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