Cosham is a northern suburb of Portsmouth in Hampshire, England, with a long history dating back to the Domesday Book. It lies within the city boundary but outside Portsea Island, offering a mix of residential streets and local amenities.
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Cosham is a northern suburb of Portsmouth lying within the city boundary but off Portsea Island, in the ceremonial county of Hampshire, England. It is mentioned in the Domesday Book of 1086 along with Drayton and Wymering (mainland) and Bocheland (Buckland), Frodington (Fratton) and Copenore (Copnor) on the island. The locality offers a blend of residential areas and local facilities, reflecting its historical roots and contemporary role as part of the Portsmouth urban area.