- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 54°59'10"N 4°56'11"W
- Eastings/Northings: 212208, 569693
- OS Grid: NX122696
- Mapcode Local: GBR GH5J.KJ6
- Mapcode Global: WH2RW.4XHT
Location and coordinates are for the approximate centre of Penwhirn Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.