- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°40'19"N 3°53'56"W
- Eastings/Northings: 271700, 309972
- OS Grid: SH717099
- Mapcode Local: GBR 90.4NPN
- Mapcode Global: WH572.23M7
Location and coordinates are for the approximate centre of Llyn Mwyngil within this administrative area.
Geographic features and populated places may cross administrative borders.