The banks and shoals of the Tsengwen estuary, built up by the accretion of silt over thousands of years, are rich in organic matter and bottomdwelling organisms, and the estuary's broad intertidal zone, with large-scale aquaculture nearby, provides a safe environment with abundant food, which attracts enormous numbers of migratory birds to rest or over winter here.
曾文溪口千百年來所沖出來的浮覆地，富含有機質、底棲生物十分豐富，加上潮間帶開闊、附近水產養殖業發達，營造了一個既安全、食物又豐盛的環境，吸引極多的旅鳥在此地歇息、渡冬。