Over 75% of the refuge's 5126 acre are composed of saltwater marsh.

The principal habitats here are brackish marsh, saltwater marsh and freshwater marsh.

The endoparasites in the saltwater marsh were dominated by trematodes (flukes), and those of the freshwater marsh by nematodes (roundworms).

Visitors enjoy more than of beach, a dense maritime forest in the interior areas, and an extensive saltwater marsh on the western side.

Saltwater marsh borders parts of the island.

The steep and varied topography and proximity to the ocean create a number of different habitats within the city limits, including tidal marsh and canyons.

Of this of the area was tidal marsh which was between the sandy embankment formed by the sea and the croft.

The route passes through a variety of landscapes including tidal marsh, open moorland and limestone gorges.

Their stretch of shoreland was mostly sandy, composed of dunes and tidal marsh.

It offers trails, a boardwalk through a freshwater tidal marsh, a pier, a pavilion, a laboratory building, and several cabins for use by school groups.