- Anglesey
- Bardsey Island
- Barry Island
- Caldey Island
- Cardigan Island
- Church Island
- Cribinau
- Flat Holm
- Gateholm
- Grassholm
- Holy Island, Anglesey
- Midland Island
- Middle Mouse
- Puffin Island
- Ramsey Island
- St Catherine’s Island
- St Margaret’s Island
- St Tudwal’s Island East
- Salt Island
- Shell Island
- The Skerries
- Skokholm Island
- Skomer Island
- South Stack
- Sully Island
- Tusker Rock
- West Mouse
- Ynys Bery
- Ynys Cantwr
- Ynys Castell
- Ynys Dulas
- Ynys Eilun and Pont yr Eilun
- Ynys Feurig
- Ynys Gaint
- Ynys Gored Goch
- Ynys Gwelltog
- Ynys Llanddwyn
- Ynys y Bîg
