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This is a list of islands of Wales, the mainland of which is part of Great Britain, as well as a table of the largest Welsh islands by area. The list includes tidal islands such as Sully Island but not locations such as Shell Island which, though they are termed islands, are peninsulas.
Name
Island group/location
Anglesey (Ynys Môn)
Irish Sea
Bardsey Island (Ynys Enlli)
Gwynedd
Barry Island (Ynys y Barri)
Vale of Glamorgan (linked to the mainland during the 1880s)
Burry Holms
Gower
Caldey Island (Ynys Bŷr)
Pembrokeshire
Cardigan Island (Ynys Aberteifi)
Ceredigion
Carreg Onnen
Pembrokeshire
Carreg Rhoson
Pembrokeshire
Carreg yr Halen
Anglesey
Cei Ballast
Porthmadog (formed from ships ballast)
Church Island (Ynys Dysilio)
Anglesey
Cribinau (Ynys Cribinau)
Anglesey
Daufraich
Pembrokeshire
Denny Island (Ynys Denny)
Monmouthshire
East Mouse (Ynys Amlwch)
Anglesey
Emsger
Pembrokeshire
Flat Holm (Ynys Echni)
Bristol Channel
Gateholm
Pembrokeshire (tidal island)
Grassholm (Gwales/Ynys Gwales)
Pembrokeshire
Holy Island (Ynys Gybi)
Anglesey
Maen Gwenonwy
Llyn Peninsula (tidal island)
Middle Head
Gower (tidal island)
Middle Mouse (Ynys Badrig)
Anglesey
Middleholm (aka Midland Isle)
Pembrokeshire
Mumbles Head Island (Y Mwmbwls)
Gower (tidal island)
North Stack (Ynys Arw)
Anglesey
Puffin Island (Ynys Seiriol)
Anglesey
Ramsey Island (Ynys Dewi)
Pembrokeshire
St Catherine's Island (Ynys Catrin)
Pembrokeshire
St Margaret's Island (Ynys Farged)
Pembrokeshire
St Tudwal's Island East (Ynys Tudwal Fach)
St Tudwal's Islands
St Tudwal's Island West (Ynys Tudwal Fawr)
St Tudwal's Islands
Salt Island (Ynys yr Halen)
Anglesey
Sheep Island (Ynys y defaid)
Pembrokeshire (tidal island)
The Skerries (Ynysoedd y Moelrhoniaid)
Anglesey
Skokholm (Ynys Sgoc-holm)
Pembrokeshire
Skomer (Ynys Skomer)
Pembrokeshire
South Stack (Ynys Lawd)
Anglesey
Sully Island
Vale of Glamorgan (tidal island)
Thorn Island
Pembrokeshire[1]
Tusker Rock (Ynys Twsgr)
Vale of Glamorgan
West Mouse (Maen y Bugail)
Anglesey
Worms Head (Pen Pyrod)
Gower (tidal island)
Ynys Benlas
Anglesey
Ynys Beri
Pembrokeshire
Ynys Cantwr
Pembrokeshire
Ynys Castell
Anglesey
Ynys Dulas
Anglesey
Ynys Eilun & Pont yr Eilun
Pembrokeshire
Ynys Faelog
Anglesey
Ynys Feurig
Anglesey
Ynys Gaint
Anglesey
Ynys Gifftan
Gwynedd (tidal island)
Ynys Gored Goch
Anglesey
Ynys Gwelltog
Pembrokeshire
Ynys Llanddwyn
Anglesey (tidal island)
Ynys Lochtyn
Ceredigion
Ynys Meicel
Pembrokeshire
Ynys Moelfre
Anglesey
Ynys Onnen
Pembrokeshire
Ynys Welltog
Anglesey
Ynys y Bîg
Anglesey
^Mystery buyer for island, 27 July 1999, BBC, accessed 31 August 2008
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