The Tha Chin river () is a distributary of the Chao Phraya river, Thailand. It splits near the town Chainat and then flows westerly from the Chao Phraya through the central plain, until it mouths into the Gulf of Thailand at the town Samut Sakhon.

Regional Names

The Tha Chin river has many regional names. After it splits from Chao Phraya river at Chainat, it's called Makhamthao River; while passing Suphan Buri it is the Suphan River; while passing Nakhon Pathom it becomes the Nakhon Chaisi river. Only near its mouth at Samut Sakhon it becomes the Tha Chin River, named after the old name of Samut Sakhon. However, for purposes of discussing the river in its entirety, the name Tha Chin is the conventional choice in most scientific documents.

Tributaries

Tributaries of the Tha Chin include the Kra Sieo, Yang, Tawip, Chorakhe Sam, Bang Len and Chin Si Rivers.

Tha Chin Basin

The Tha Chin drains a total area of 13,681 square kilometers.

The Tha Chin Basin is part of the Chao Phraya Watershed.