Denny Island (grid reference ST459810) is a small rocky island of 0.24 hectares (0.6 acre), with scrub vegetation, in the Severn Estuary. Its rocky southern foreshore marks the boundary between England and Wales. Above high water mark, the island is reckoned administratively to Monmouthshire, South Wales. The island also marks the north-western limit of the City of Bristol's water boundary in the Severn estuary.
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Magor with Undy