Passing through Tha Wung district and the town of Lopburi, it enters the Chao Phraya together with the Pa Sak River at the town of Ayutthaya. It is about  long.
Passing through Tha Wung district and the town of Lopburi, it merges into the Chao Phraya along with the Pa Sak River at the town of Ayutthaya. It is approximately long.