- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°14'0"N 4°9'3"W
- Eastings/Northings: 256532, 372882
- OS Grid: SH565728
- Mapcode Local: GBR 5P.064Y
- Mapcode Global: WH541.6ZLH
Location and coordinates are for the approximate centre of Ynys y Big within this administrative area.
Geographic features and populated places may cross administrative borders.