 The Tha Chin river has many regional names.After it splits from Chao Phraya river at Chai Nat, it is called Makham Thao River; while passing Suphan Buri it is the Suphan River; while passing Nakhon Pathom it becomes the Nakhon Chai Si river.Only near its mouth at Samut Sakhon does it become the Tha Chin River, named after the former name of Samut Sakhon.