Keyhaven, Pennington, Oxey and Normandy Marshes, also known as the North Solent Marshes, are three areas of saltmarsh in Hampshire, England. The haven outpost of Milford-on-Sea, Keyhaven sits to the west, the village of Pennington to the north, and the town of Lymington to the northeast. The marshes lie behind Hurst Spit and fall within the Hurst Castle And Lymington River Estuary Site of Special Scientific Interest.