Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Ping River - The Ping River (Thai: RTGS: Maenam Ping IPA: [mnam pi]) along with the Nan River is one of the two main contributaries of Chao Phraya River. It originates at Doi Thuai Daen Lao Range in Chiang Dao district Chiang Mai Province. After passing Chiang Mai town it flows though the provinces Lamphun Tak and Kamphaeng Phet. At the confluence with the Nan River at Nakhon Sawan (also named Paknam Pho in Thai) it forms the Chao Phraya River.
A:
Natural Place