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 |
| Ballast Bank/Lewis's Island (Cei Ballast) | Porthmadog (artificial island formed from ships ballast) |
| Bardsey Island (Ynys Enlli) | Gwynedd |
| Barry Island (Ynys y Barri) | Vale of Glamorgan (linked to the mainland since 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 |
| 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 | Llŷn 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 |
| 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 |
Largest islands in Wales
| Island | Area (sq mi) | Area (km2) | |
|---|---|---|---|
| 1 | Anglesey | 260.37 | 674.36 |
| 2 | Holy Island | 15.22 | 39.44 |
| 3 | Skomer | 1.12 | 2.90 |
| 4 | Ramsey Island | 0.99 | 2.58 |
| 5 | Caldey Island | 0.84 | 2.18 |
| 6 | Bardsey Island | 0.79 | 2.06 |
| 7 | Skokholm | 0.41 | 1.06 |
| 8 | Flat Holm | 0.21 | 0.33 |
| 9 | Ynys Llanddwyn | 0.19 | 0.3 |
| 10 | Puffin Island | 0.11 | 0.28 |
| 11 | Cardigan Island | 0.06 | 0.15 |
- Holy Island and Anglesey are often counted together as they are separated by such a narrow channel.
Inland islands
There are no islands of any great size in lakes in Wales. The crannog in Llangorse Lake is an artificial island. Several reservoirs contain islets e.g. Llyn Brenig, Elan Valley Reservoirs and Llyn Trawsfynydd, the last named having the largest and most numerous, though some are linked by causeways.
See also
wikipedia, wiki, encyclopedia, book, library, article, read, free download, Information about List of islands of Wales, What is List of islands of Wales? What does List of islands of Wales mean?