- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°38'12"N 4°41'20"W
- Eastings/Northings: 214008, 196530
- OS Grid: SS140965
- Mapcode Local: GBR GF.STBS
- Mapcode Global: VH2PZ.N4X4
Location and coordinates are for the approximate centre of Ynys Byr within this administrative area.
Geographic features and populated places may cross administrative borders.