- Category: Water Feature
- Type: Island
- Latitude/Longitude: 49°54'18"N 6°18'25"W
- Eastings/Northings: 90848, 9438
- OS Grid: SV908094
- Mapcode Local: GBR BXTY.1T8
- Mapcode Global: VGYC4.MNJ3
Location and coordinates are for the approximate centre of The Chair within this administrative area.
Geographic features and populated places may cross administrative borders.