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Summary: Silt lagoons dating from the late 1970s/early 1980s (still too wet to walk on in 1985), now mostly dry sandy and gravelly grassland with areas of lichen heath and a certain amount of scrub invasion, adjacent to saltmarsh by River Thames.
Reason for interest: Nationally important invertebrate fauna including numerous rare and scarce species of dry grassland and lichen heath, dune, seasonally wet and saline habitats.
Comment: Originally designated for bird interest, but now extremely important for its invertebrate fauna.