List of islands of Wales

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 	PembrokeshireMystery buyer for island, 27 July 1999, BBC, accessed 31 August 2008
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.
==Places called "island" or "ynys" that are not islands==
Some places around the Welsh coast are called island or (Welsh) ynys, but are not. Caution is required in that whilst 'ynys' most commonly translates as island, it has other meanings too. Some of these named places were formerly islands surrounded by marshland. Others are peninsulas or just coastal settlements. They include:
* Barry Island (tidal island until the construction of Barry Docks in the 1880s)
* Berges Island, peninsula at Whitford Burrows, Gower
* Dinas Island, peninsula on Pembrokeshire coast
* Farchynys, locality beside Mawddach estuary, Bontddu, Gwynedd
* Little Island, peninsula at the west end of the former Barry Island
* Shell Island
* Traeth Mawr - there are multiple examples of names including 'ynys' around Traeth Mawr, the now drained estuarine flats of the Afon Glaslyn, Gwynedd, including Hir Ynys, Ynys y Gwely, Ynys Ceiliog, Ynys Fawr, Ynys-fach and Ynys Fer-las.
* Ynys, hamlet on an area of raised ground known as Ynys Llanfihangel-y-traethau at Morfa Harlech, Gwynedd
* Ynys and nearby Ynys-fach on coast south of Dinas Dinlle, Gwynedd
* Ynysboeth, area of Abercynon in the Cynon Valley, Mid Glamorgan
* Ynysddu, village in the Sirhowy valley, Caerphilly County Borough
* Ynyshir, village in the Rhondda, Mid Glamorgan
* Ynyslas, locality at Borth, north Ceredigion - there are multiple examples of names including 'ynys' around the Dovey estuary including Ynys Tachwedd, Ynysfergi, Ynys Greigiog, Ynys-hir, Ynys Edwin, Ynys-Eidiol and simple 'Ynys'.
* Ynys Leurad, a small peninsula near Four Mile Bridge, Anglesey
* Ynysmaerdy, village near Llantrisant, Rhondda Cynon Taf
* Ynyswen, village in the Rhondda, Mid Glamorgan
* Ynysybwl, village between the Rhondda and Cynon Valleys, Mid Glamorgan
== See also ==
* List of the British Isles
==References==
 Islands of Wales
Islands
Wales
Wales
Category:Wales geography-related lists