This was formerly a tidal estuary, but one way valves block salt water and it is now freshwater river and marshes, wet meadows bisected by ditches, and fen. It is important for wetland breeding birds, such as
bearded reedlings,
sedge warblers and
reed warblers. The site is managed to provide ideal conditions at different times of the year, with water levels lowered at the end of the waterfowl breeding season in order to expose food-rich mud to encourage migrating birds. Other areas of water are cleared in order to attract dragonflies and damselflies.
Frogbit and
flowering rush are also encouraged to grow because of this water management. Other flora include
slender bird's-foot-trefoil and
marsh mallow. The Walkway Pond is home to
dragonflies,
damselflies,
moorhen,
mallard and a variety of
warblers.
Water voles have been reintroduced to the reserve and the River Meon, as part of a project by
South Downs National Park,
Hampshire & Isle of Wight Wildlife Trust and
The Environment Agency. The reserve has a number of
hides, Cottage Hide, Meon Shore Hide, Knights Bank Hide, Meadow Hide, Pumfrett Hide, Spurgin Hide, Suffern Hide and West Hide, from which it is possible to observe the local wildlife, which includes
fox and
deer as well as waterfowl. == Amenities ==