- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°57'40"N 3°50'36"W
- Eastings/Northings: 276264, 342030
- OS Grid: SH762420
- Mapcode Local: GBR 62.KGTQ
- Mapcode Global: WH55J.XTWN
Location and coordinates are for the approximate centre of Llyn y Dywarchen within this administrative area.
Geographic features and populated places may cross administrative borders.