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Hollyhock Island is an uninhabited island, about 50 metres long, in the River Thames in England on the reach above Penton Hook Lock. It is in a small channel between the northern (traditional Buckinghamshire) bank of the Thames and the larger Holm Island, opposite the town of Staines on the southern (Surrey) bank.
It is about 400 m downstream of the M25 Runnymede Bridge.
References
Hollyhock Island Wikipedia(Text) CC BY-SA