- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°57'1"N 5°10'14"W
- Eastings/Northings: 182206, 232754
- OS Grid: SM822327
- Mapcode Local: GBR C9.MB3T
- Mapcode Global: VH1QQ.B79L
Location and coordinates are for the approximate centre of Ynys-fach within this administrative area.
Geographic features and populated places may cross administrative borders.