The wetland is located at the estuary of the Yanshui River, bordering zone A2 of Sicao Wetland. From the north, the wetland starts from the north levee of the Yanshui River main drainage. To the south, it meets Anping levee. In the east, it borders the Provincial Highway No. 17 and Guanhai Bridge in Dagang. In the west, it extends to the 6m depth contour in the waters. Totally, it occupies a total area of 635 hectares. In recent years, the intermediate egret (Ardea intermedia) reproduces along the coastal area in southwestern Taiwan and establishes a new stock. Both the great egret (Ardea alba) and intermediate egret (Ardea intermedia) are found nesting in the mangrove area at the estuary of the Yanshui River in Tainan City. In volume 58 of the Journal of National Taiwan Museum, a new species of the Genus Fronsella called Fronsella taiwanica is found in the wetland. Ecological resources in the wetland cover endangered species: the oriental stork (Ciconia boyciana) and black-faced spoonbill (Platalea minor); the rare and valuable species: the western marsh harrier (Circus aeruginosus), western osprey (Pandion haliaetus), common kestrel (Falco tinnunculus), little tern (Sternula albifrons), and melodious laughingthrush (Garrulax canorus); and the conservation-deserving species: brown shrike (Lanius cristatus) and Chinese crown orchid (Eulophia graminea).