The Zengwen River is the fourth longest river in Taiwan after the Zhuoshui River, Gaoping, and Tamsui, with a total length of about 146 km (91 mi). It flows through Tainan and Chiayi County.It is located in the southwestern part of the island. ^[1]

Zéngwén is the pinyin romanization of the Mandarin pronunciation of the river's Chinese name 曾文溪. The river was formerly known as the Tsan-bun^[2][3] from the Hokkien pronunciation of the same name.

It was formerly known as the Taiwanfu^[4] from a former name of Tainan, when it was the headquarters of Qing administration on the island as a district of Fujian Province.

The largest reservoir in Taiwan, Zengwen Reservoir, formed by Zengwen Dam, is located Located upstream of Zengwen River.^[5]

Taijiang National Park encompasses parts of the Zengwen estuary as well as nearby coastal areas.^[6] The endangered black-faced spoonbills come every winter as migrants and inhabit downstream near the estuary, where many other waterfowls are also found. A conservation area has been set up to protect the spoonbills.^[7][8]

• List of rivers in Taiwan