Calshot Marshes Local Nature Reserve

Saltmarsh and inter-tidal mudflats lying within the shelter of Calshot Spit, close to the Calshot Activities Centre

calshot marshes nature reserve

About the site

Calshot Marshes is an area of mudflats and saltmarsh at the southern end of Southampton Water. It forms part of the Hythe to Calshot Site of Special Scientific Interest (SSSI) because of its nationally important numbers of migratory and over-wintering waders and wildfowl.


The SSSI regularly supports more than 1% of the national winter populations of Wigeon, Teal, Ringed Plover, Grey Plover, Black-tailed Godwit, Redshank and Dunlin. During the winter months it also has a significant population of Dark Bellied Brent Geese and is considered to be of national significance to each of these species.

The numbers of some other species, Great Crested Grebe, Gadwall and Shoveler, often approach nationally important population levels. Total numbers of all waterfowl regularly exceed 10,000 in winter.

This protected area is crucial because of the immense industrial pressures that surround it.

Contact us

Central New Forest, The Old Courthouse, Avenue Road, Lymington, Hampshire, SO41 9YB

Phone 01590 674656

Email [email protected]