Ynys Gaint is a small island in the Menai Strait connected to the town of Menai Bridge on Anglesey by a causeway (which still exists today) and also a concrete bridge erected by Sir William Fison (a previous owner of the island) in the 1930s. Literally translated Ynys Gaint mean Kent Island.

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Ynys Gaint lies close to the Anglesey shore at OS reference SH561725, between Ynys Faelog and Ynys Castell. Between 1942 and 1944 the island housed a Royal Air Force air-sea rescue unit, with several high speed launches, and a small part of the island is still occupied by the MOD, housing a Royal Naval Auxiliary Service (RNXS) unit until 1994. A quasi-military presence remains on the island in the form of an Army Cadet unit and the Maritime Volunteer Service.^[1] There are also two privately owned residential properties on Ynys Gaint. One of these had a portion of its garden designed by Sir Clough Williams-Ellis, of Portmeirion fame.