The SSSI is a long, narrow strip of coast that starts at the eastern boundary of The Wash between Old Hunstanton and Holme-next-the-Sea, and runs east for about 43 km (27 mi) to Kelling.
The SSSI has a wide variety of habitats, with bare mud, sand and shingle characterising the intertidal zone along the whole of the coast, although higher areas may have algae or eelgrass that are grazed by ducks and geese in winter.