- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°33'45"N 3°27'51"W
- Eastings/Northings: 300845, 297097
- OS Grid: SO008970
- Mapcode Local: GBR 9L.CMRD
- Mapcode Global: WH68S.RVK9
Location and coordinates are for the approximate centre of Llyn Mawr within this administrative area.
Geographic features and populated places may cross administrative borders.