- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°59'29"N 3°54'49"W
- Eastings/Northings: 271649, 345496
- OS Grid: SH716454
- Mapcode Local: GBR 5Z.HHT6
- Mapcode Global: WH55H.V2JK
Location and coordinates are for the approximate centre of Llyn Dwr-oer within this administrative area.
Geographic features and populated places may cross administrative borders.