Cley Marshes

nature reserve on the North Sea coast of England

Cley Marshes is a 176-hectare (430-acre) nature reserve on the North Sea coast of England. It is just outside the village of Cley next the Sea, Norfolk. It has been a reserve since 1926. It is the oldest of the reserves belonging to the Norfolk Wildlife Trust (NWT).

Cley Marshes protects an area of reed beds, freshwater marsh, pools and wet meadows. It has been designated as a Site of Special Scientific Interest (SSSI), Special Area of Conservation (SAC), Special Protection Area (SPA) and Ramsar Site because of the large numbers of birds it attracts.