An area of saltmarshes and mudflats (a remnant of a former estuary) with a dune system and polders with halophile creeks and grasslands, several reedbeds and canals fringes with reed. The dune and saltmarsh area extends across the border into the Netherlands.
The site supports internationally important numbers of wintering geese. Significant numbers of gulls, terns and meadow birds also breed and the dunes are an important staging site for migrating passerines.
BirdLife International (2019) Important Bird Areas factsheet: Zwin. Downloaded from http://www.birdlife.org on 12/12/2019.