- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°15'1"N 4°46'22"W
- Eastings/Northings: 202422, 42612
- OS Grid: SX024426
- Mapcode Local: GBR ZY.T9NK
- Mapcode Global: FRA 08WC.JDT
Location and coordinates are for the approximate centre of Maen Thomas within this administrative area.
Geographic features and populated places may cross administrative borders.