Tianjin Beidagang Wetlands lies in a transitional area of inland and coastal wetlands where the Duliujian River meets Bohai Bay. Located just to the south of the city of Tianjin, the site covers a small part (3%) of the greater Beidagang Provincial Wetland Nature Reserve. It is mainly composed of permanent freshwater marshes, rivers and ponds. The site provides exceptional habitat for waterbirds, and its situation on the East Asian – Australasian Flyway migration route results in annual total numbers regularly exceeding 400,000. Among these are threatened species including the critically endangered Baer’s pochard (Aythya baeri) and Siberian crane (Grus leucogeranus) as well as the endangered Oriental stork (Ciconia boyciana) and great knot (Calidris tenuirostris). More than 1% of the biogeographical populations of a number of species have been recorded within the site, including the common pochard (Aythya ferina) and swan goose (Anser cygnoides). Ecosystem services provided by the wetland include pollution control and detoxification as well as flood control.