Longnan is a prefecture-level city located in the southeastern region of Gansu province, China. It serves as a geographical point bordering Sichuan province to the south and Shaanxi province to the east.
According to the 2020 Chinese census, the population of the prefecture-level city was 2,407,272. Of this total population, 546,616 residents live within the built-up area of the Wudu District.