Lymington and Keyhaven Marshes Local Nature Reserve is an area of coastal grazing marsh. It lies between the town of Lymington and the coastal village of Keyhaven.
Hampshire County Council began purchasing the area in 1974 when?it bought Normandy Farm. Pennington Marshes were bought in 1979 followed in 1984 by Keyhaven Marshes. This far-sighted policy was a response to the rapid rate of development and loss of habitat in previous decades.