- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°8'19"N 4°24'38"W
- Eastings/Northings: 238842, 362889
- OS Grid: SH388628
- Mapcode Local: GBR 5B.691K
- Mapcode Global: WH43C.6CXN
Location and coordinates are for the approximate centre of Ynys Llanddwyn within this administrative area.
Geographic features and populated places may cross administrative borders.