- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°53'40"N 4°0'10"W
- Eastings/Northings: 265351, 334888
- OS Grid: SH653348
- Mapcode Local: GBR 5W.PL2T
- Mapcode Global: WH55V.HH0V
Location and coordinates are for the approximate centre of Llyn Dywarchen within this administrative area.
Geographic features and populated places may cross administrative borders.