The Walberswick marshes section of the reserve is largely in private ownership and managed by Natural England.
Rabbits played a major role in maintaining this landscape until the mixamatosis outbreak of 1953 after which much the heathland area of the reserve began to revert to birth woodland.
It contains a range of habitats including reedbed, hay meadows, grazing marshes, heather and grass heathlands and a variety of mixed and broadleaved woodlands.
Along the coast shingle banks and beaches, saline lagoons and intertidal estuary and saltings are also present, providing a range of fresh, brackish and salt water habitats, whilst the area along the Blyth estuary provides mudflats and grazing marsh.
Flora found in the reserve include species such as marsh sowthistle, bog pimpernel, sneezewort, and greater bladderwort in the wetland areas.
Dingle Marshes contains a mixture of coastal and freshwater wetland habitats, including brackish pools.