|Native name: Ynys Denny|
|Area||2,400 m2 (26,000 sq ft)|
Denny Island (grid reference ) is a small rocky island of 0.24 hectares (0.6 acres), 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.
It is located approximately three miles north of Portishead, midway between Redwick in Wales and Avonmouth in England. It is surrounded by sandbanks known as the Welsh Grounds. Its foreshore area changes dramatically according to the state of the tide, because tides in the estuary and Bristol Channel are the second highest in the world, reaching 13.7 m (45 ft) at the spring equinox. It is known as a nesting-place for gulls, cormorants and other seabirds, which are regularly seen and ringed there.
Denny Island appears in the historical record for the first time as Dunye, in the charter recording the creation of the county of Bristol in 1373. This suggests that the name means, in Old English, 'island shaped like a down (i.e. a hill with a rounded profile)'. It gives its name to the Denny Island Fault Zone, a part of the Avon-Solent Fracture zone.
- Bristol City Council - Beating Bristol's water boundary
- Harding, N. Dermott (1930). Bristol charters, 1155-1373 p 154-5. Bristol Record Society.
- Kellaway, G.A. (1996). "Discovery of the Avon-Solent Fracture Zone and its relationship to Bath hot springs.". Environmental Geology. 28 (1): 34–9. doi:10.1007/s002540050076.
- "Appeal Decision" (PDF). Planning Inspectorate,. November 2004. Retrieved 2007-05-21.
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