- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°52'5"N 5°20'1"W
- Eastings/Northings: 170586, 224102
- OS Grid: SM705241
- Mapcode Local: GBR C2.SKPD
- Mapcode Global: VH0TK.H9MP
Location and coordinates are for the approximate centre of Y Llech within this administrative area.
Geographic features and populated places may cross administrative borders.