- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°8'7"N 4°25'9"W
- Eastings/Northings: 238252, 362535
- OS Grid: SH382625
- Mapcode Local: GBR 5B.6DY2
- Mapcode Global: WH43C.2GT5
Location and coordinates are for the approximate centre of Ynys yr Adar within this administrative area.
Geographic features and populated places may cross administrative borders.