St Mary's Island, is part of the Chatham Maritime development area in Medway, South East England. It is located at the northern end of Chatham, adjacent to Brompton and Gillingham. Once part of the Royal Dockyard, Chatham, the area had consisted of a mixture of sports fields and warehousing during the later years of the Royal Navy's time in occupation.St.Mary's Island is divided from mainland Chatham by three basins used by the dockyard.HistoryThe Romans were the first people to use the Island. They constructed a road through the marshy swamp criss-crossed by tidal channels land, and established a ferry route from the Island to the Hoo Peninsula. The ferry was named 'Prince's Bridge' on early maps, it was used until the final years of the last century.The 3 dockyard basins are sited on St Mary's Creek, which passed from the River Medway, near Gillingham to the River Medway (again) near Chatham. In 1575, the creek was blocked with stakes, as a defensive method against the Spanish forces. In 1585, a chain was placed across the River Medway, secured on the island and linked with a Wheelhouse at Upnor Castle. It would have been raised in times of danger. In the 1600s, a fort was built at the mouth of the creek, since the creek was now a passageway to the thriving dockyard. The fort had 54 guns of various calibres, but it has since been demolished. It was called Gillingham Fort. In 1663, Samuel Pepys mentions St.Mary's Creek, twice in his famous diaries, while travelling towards the dockyards.