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Portsea Island

Portsea Island (left), separated from the mainland (right) by the narrow, tidal Portsea Creek Portsea Island is a flat and low-lying natural island 24.5 km2 in area, just off the southern coast of Hampshire in England. The island contains the majority of the city of Portsmouth. Island has the third-largest population of all the islands in the British Isles after the mainlands of Great Britain and Ireland; it also has the highest population density of any British Isle, and Portsmouth has the highest population density of any city in the UK, excluding the ceremonial county of Greater London which does not have official city status.

Portsea Island

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Portsea

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Portsea Island (left), separated from the mainland (right) by the narrow, tidal Portsea Creek Portsea Island is a flat and low-lying natural island 24.5 km2 in area, just off the southern coast of Hampshire in England. The island contains the majority of the city of Portsmouth. Island has the third-largest population of all the islands in the British Isles after the mainlands of Great Britain and Ireland; it also has the highest population density of any British Isle, and Portsmouth has the highest population density of any city in the UK, excluding the ceremonial county of Greater London which does not have official city status.

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The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 26 September 2026.

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