The Zengwen River originates from Dongshui Mountain in Alishan Township, Chiayi County. It flows through several districts in Tainan City, including Nansi, Yujing, Danei, Shanshang, Shanhua, Guantian, Madou, Anding, Xigang, and Qigu, eventually emptying into the Taiwan Strait between Annan and Qigu Districts. The river stretches 138.5 kilometers in length, with a drainage area of 1,176.7 square kilometers. Its source sits at an elevation of 2,440 meters above sea level. Major tributaries include the Tanaiku River, Puyanu River, Caolan River, Houpu River, Cailiao River, and Guantian River. Historically, the Zengwen River frequently changed its course, earning it the nickname “Green-Blind Snake” among locals. After the completion of embankments in 1938 (Showa 13), the river's path stabilized. In Tainan, the Zengwen River often serves as a natural boundary, dividing the southern (Xinan) and northern (Xibei) regions. The southern area, centered around the former Tainan Provincial City, has a more metropolitan character, while the northern area is more rural, centered around Xinying City, the former Tainan County seat. The Zengwen River boasts abundant hydrological resources. Taiwan’s largest reservoir, the Zengwen Reservoir, is located on its upper reaches. Other notable reservoirs along its tributaries include the Nanhua and Wushantou Reservoirs. These not only serve water supply and hydroelectric purposes but have also become significant tourist attractions. Additionally, as the river carries sand and biological debris to its estuary, it forms nutrient-rich deposits that nurture a diverse array of benthic and planktonic organisms. This fertile estuarine habitat attracts large numbers of waterbirds. Among them is the rare and endangered black-faced spoonbill, which nests on the northern shore of the Zengwen River estuary. As a result, the Qigu Black-Faced Spoonbill Reserve was established in the area. The Zengwen estuary is also part of Taijiang National Park, Taiwan’s eighth national park. The Yujing section of the Zengwen River lies downstream of the Zengwen Reservoir. A geological syncline known as the Yujing Syncline runs through the region. The terrain features a longitudinal valley basin composed mainly of sandstone and shale from the Upper and Middle Miocene.

Attraction Information:

Address: Yujing District, Tainan City