- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°14'10"N 4°32'28"W
- Eastings/Northings: 230501, 374028
- OS Grid: SH305740
- Mapcode Local: GBR 55.01BK
- Mapcode Global: WH42Q.6XSF
Location and coordinates are for the approximate centre of Ynys Feirig within this administrative area.
Geographic features and populated places may cross administrative borders.