- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°2'43"N 4°31'34"W
- Eastings/Northings: 226853, 241573
- OS Grid: SN268415
- Mapcode Local: GBR D5.F7Y3
- Mapcode Global: VH2MY.HVHC
Location and coordinates are for the approximate centre of Ynys Fach within this administrative area.
Geographic features and populated places may cross administrative borders.