Islands

This is a list of the islands of Wales, the mainland of which is part of Great Britain, as well as a table of the largest Welsh islands by area.

Anglesey - Irish Sea
Bardsey Island - Gwynedd
Barry Island - Bristol Channel (linked to the mainland during the 1880s)
Caldey Island - Pembrokeshire
Cardigan Island - Ceredigion
Flat Holm - Bristol Channel

Gateholm Island - Pembrokeshire
Holy Island - Anglesey Anglesey
Midland Island - Pembrokeshire
Puffin Island - Anglesey
Ramsey Island - Pembrokeshire
St Catherine's Island - Pembrokeshire

St Margaret's Island - Pembrokeshire
St Tudwal's Island East St Tudwal's Islands
St Tudwal's Island West St Tudwal's Islands
Sheep Island - Pembrokeshire
Shell Island - Gwynedd
The Skerries - Anglesey

Skokholm Island - Pembrokeshire
Skomer Island - Pembrokeshire
Sully Island - Vale of Glamorgan
Tusker Rock - Vale of Glamorgan
Ynys Bery - Pembrokeshire

Largest islands in Wales

Island Area (sq mi) Area (sq km)
1 Anglesey - 275.60 - 713.80
2 Holy Island - 15.22 - 39.44
3 Skomer Island - 1.12 - 2.90
4 Ramsey Island - 0.99 - 2.58
5 Caldey Island - 0.84 - 2.18
6 Bardsey Island - 0.76 - 1.99
7 Skokholm - 0.41 - 1.06
8 Flat Holm - 0.13 - 0.33
9 Puffin Island - 0.11 - 0.28
10 Cardigan Island - 0.06 - 0.15