- Category: Populated Place
- Type: Suburban Area
- Latitude/Longitude: 51°47'20"N 3°44'54"W
- Eastings/Northings: 279500, 211500
- OS Grid: SN795115
- Mapcode Local: GBR Y6.YGTQ
- Mapcode Global: VH5G2.Z968
Location and coordinates are for the approximate centre of Ynys-isaf within this administrative area.
Geographic features and populated places may cross administrative borders.