- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°57'14"N 4°0'12"W
- Eastings/Northings: 265500, 341500
- OS Grid: SH655415
- Mapcode Local: GBR 5V.KZZM
- Mapcode Global: WH55N.G0SR
Location and coordinates are for the approximate centre of Llyn Mair within this administrative area.
Geographic features and populated places may cross administrative borders.