Spithead has been strongly defended since 1864 by fortifications complementing those of Portsmouth.
Portsmouth | Portsmouth F.C. | Portsmouth, New Hampshire | Portsmouth, Ohio | Portsmouth Abbey School | Portsmouth, Virginia | HMNB Portsmouth | University of Portsmouth | Portsmouth International Port | Portsmouth Cathedral | Portsmouth, Rhode Island | Portsmouth, Dominica | Portsmouth Harbour railway station | Portsmouth and Southsea railway station | Portsmouth Naval Prison | Portsmouth Invitational Tournament | Louise de Kérouaille, Duchess of Portsmouth | Treaty of Portsmouth | Portsmouth Direct Line | Portsmouth Point | Portsmouth Naval Shipyard | Portsmouth Block Mills | Oliver Wallop, 8th Earl of Portsmouth | Norfolk and Portsmouth Belt Line Railroad | Gerard Wallop, 9th Earl of Portsmouth | Fortifications of Metz | Fortifications of Copenhagen (17th century) | Springfield School, Portsmouth | Portsmouth, West Yorkshire | Portsmouth (UK Parliament constituency) |