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.
The waterway passes through Tha Wung district and the town of Lopburi before joining the Chao Phraya, which also flows from the Pa Sak River in the town of Ayutthaya. Its length is about this much.