- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°51'57"N 5°16'51"W
- Eastings/Northings: 174213, 223684
- OS Grid: SM742236
- Mapcode Local: GBR C5.SLSD
- Mapcode Global: VH0TL.FC2G
Location and coordinates are for the approximate centre of Llech Cyllyll within this administrative area.
Geographic features and populated places may cross administrative borders.