 The main rivers of the district are the Nan and Ping, which meet in the town of Nakhon Sawan to form the Chao Phraya.In the eastern part of the district is the Bueng Boraphet swamp, the most important wetland of the province.Mueang Nakhon Sawan is divided into 17 subdistricts ("tambons"), which are further subdivided into 172 administrative villages ("mubans").