Memphis is a city in the U.S. state of Tennessee. It is the seat of Shelby County in the southwest part of the state; it is situated along the Mississippi River. With a population of 633,104 at the 2020 U.S. census, Memphis is the second-most populous city in Tennessee, after Nashville.
Memphis is the fifth-most populous city in the Southeast, the nation's 28th-largest overall, as well as the largest city bordering the Mississippi River. The Memphis metropolitan area includes West Tennessee and the greater Mid-South region, which includes portions of neighboring Arkansas, Mississippi and the Missouri Bootheel. One of the more historic and culturally significant cities of the Southern United States, Memphis has a wide variety of landscapes and distinct neighborhoods.
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.