- Category: Water Feature
- Type: Island
- Latitude/Longitude: 49°56'33"N 6°22'50"W
- Eastings/Northings: 85817, 13928
- OS Grid: SV858139
- Mapcode Local: GBR BXMT.XVP
- Mapcode Global: VGYBX.CP4S
Location and coordinates are for the approximate centre of Illiswilgig within this administrative area.
Geographic features and populated places may cross administrative borders.