- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°22'48"N 4°29'11"W
- Eastings/Northings: 234713, 389898
- OS Grid: SH347898
- Mapcode Local: GBR HM9R.TZ8
- Mapcode Global: WH425.19WN
Location and coordinates are for the approximate centre of Llyn Llygeirian within this administrative area.
Geographic features and populated places may cross administrative borders.