The Site is a complex of four separate areas – Grandefjæra, Hovsfjæra, Innstrandfjæra and Kråkvågsvaet – which form part of a large system of shallow marine waters, intertidal zones and mudflats. The intertidal area features salt-tolerant vegetation, with some nationally endangered species such as the Northern marsh orchid Dactylorhiza purpurella present. Due to its location on the flyway for birds migrating along the Norwegian coast to and from their breeding locations in Greenland, Svalbard, Iceland and Siberia, the Site is the most important wetland system in central Norway for resting and feeding migratory waterbirds, especially ducks and waders. The nationally threatened harbour seal Phoca vitulina also regularly visits. Human activities have included drainage for agricultural purposes, but strict regulations now prevent construction, hunting and drainage. The Site is used for fishing, birdwatching, sheep grazing and small-scale seaweed cutting, and also has some value in shoreline stabilization. Visitor facilities include a wetland information centre in Brekstad, as well as observation towers and hides.