- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°4'3"N 3°25'41"W
- Eastings/Northings: 302208, 241979
- OS Grid: SO022419
- Mapcode Local: GBR YM.CY20
- Mapcode Global: VH6BC.J9LD
Location and coordinates are for the approximate centre of Llyn Pen-y-lan within this administrative area.
Geographic features and populated places may cross administrative borders.