Hollyhock Island is a long, narrow, inhabited island in the
River Thames in England on the reach above
Penton Hook Lock, administratively in the extreme eastern end of
Wraysbury,
Berkshire in the middle of a small backwater, close to the northern bank. The centre of the town of
Staines-upon-Thames is approximately five times nearer than the centre of Wraysbury village, of which the island is part.