Tianshui is a prefecture-level city in Gansu province, China, and is the province's second-largest city. Located in the southeast of the province, the city strides along the upper reaches of the Wei River and at the boundary of the Loess Plateau and the Qinling Mountains. As of the 2020 census, its population was 2,984,659 inhabitants, of which 1,212,791 lived in the built-up area made of the 2 urban districts of Qinzhou and Maiji.