- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°7'55"N 3°45'13"W
- Eastings/Northings: 280052, 249656
- OS Grid: SN800496
- Mapcode Local: GBR Y6.7TRG
- Mapcode Global: VH5DB.WNCT
Location and coordinates are for the approximate centre of Llyn Brianne within this administrative area.
Geographic features and populated places may cross administrative borders.