Dingxi, also known as Longyou, is a prefecture-level city located in the southeastern region of Gansu province in the People's Republic of China. It serves as a significant administrative division within the province.
According to the 2020 census, the city has a total population of 2,524,097 inhabitants. Of this population, 422,383 residents live within the built-up area of the Anding urban district.