Chenglong Wetlands Wetlands was formed due to the low altitude of the Lower Hukou area of Kouhu Township and the longstanding over-extraction of groundwater which resulted in serious land subsidence and frequent floods. The above-mentioned problems, compounded by the sea encroachment caused by typhoons, have turned the area into wetlands unsuitable for farming. Covering an area of 50 hectares, Chenglong Wetlands is a coastal spot suitable for bird-watching. The Wetlands is biologically rich with rare wild birds like black-faced spoonbills, mallards, greater painted-snipe, water redstarts, and short-eared owls.