Pewit Island is a small island located in the north western section of Portsmouth Harbour.[1] Historically it appears to have been connected to the mainland via a manmade shingle causeway, parts of which still exist.[1] The island has been colonised by oak and blackthorn scrub and is home to species including sea lavender and golden samphire plants.[2] The island is currently a Hampshire and Isle of Wight Wildlife Trust nature reserve.[3]
In 1857 plans drawn up to improve the defences of Portsmouth included building a fortification on the island.[4] The plans were later modified in the face of improved artillery technology and the fortification was never built.[4]
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