Chatham Naval Memorial is a large obelisk situated in the town of Chatham, Kent, which is in the Medway Towns.The memorial is a feature of the Great Lines Heritage Park. The huge expanse of the Great Lines was in its own right a layer of defence to protect Chatham Dockyard from attack. Chatham was a principal manning port of the Royal Navy during the First World War and thus was dedicated as the site of one of three memorials to sailors, airmen and marines of the Royal Navy who lost their lives during the conflict but who have no known grave.