Liu (lù) An, also known as "Gaocheng", "Western Anhui", Anhui Province, prefecture-level city, located in the western part of Anhui Province, the northern foot of the Dabie Mountains, the western flank of the Yangtze River delta, adjacent to the provincial capital of Hefei City, the terrain southwest of the high and steep, northeast of the low flat, trapezoidal distribution, belonging to the northern subtropical transition zone to the warm temperate zone, with a total area of 15,451.2 square kilometers. It belongs to the transition zone of the north subtropical zone to the warm temperate zone, with a total area of 15,451.2 square kilometers. As of February 2023, the city has three districts and four counties under its jurisdiction. As of the end of 2022, Lu'an had a resident population of 4.379 million. The name of Lu'an began with Emperor Wu of Han Dynasty, taking Hengshan domestic six counties, Anfeng, Anfeng and other counties of the first word, don't Hengshan country for the country of Lu'an, and the meaning of "six peace, never rebel", because Shun sealed Gaotao in the six, so the later generations called Lu'an Gaocheng; Lu'an is a famous old revolutionary area, known as the cradle of the Red Army, the generals of the hometown of natural and humanistic environment is mainly reflected in the "lapel" of the city, the city's population of 437,000 people, the city's population of 445,000 square meters. The natural and humanistic environment is mainly reflected in the regional characteristics of "river-banding", the geographical location of "bearing the east and connecting the west", and the beautiful scenery of "mountain-ringing Yinghuo"; the luxuriant river and the main canal of luxuriant river flow through the urban area of more than 20 km, forming 25,000 acres of water surface, which is the largest water surface in China. It forms an urban ecological belt with 25,000 mu of water surface and 5,000 mu of green land on both sides of the river. There are many natural and humanistic landscapes in the city, with 26 scenic spots of national 4A level or above (among which there are 2 5A level), 9 national red tourist attractions and scenic spots, 15 provincial red tourist attractions and scenic spots, 2 national regional tourism demonstration zones, and 3 provincial tourist resorts. in 2023, the city was rated as a third-tier city. In 2023, Lu'an realized a GDP of 211.34 billion yuan, a year-on-year growth of 6.2% at constant prices.