- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°57'3"N 4°16'43"W
- Eastings/Northings: 243500, 230500
- OS Grid: SN435305
- Mapcode Local: GBR DH.M9CC
- Mapcode Global: VH3L3.S7D8
Location and coordinates are for the approximate centre of Nant Alltwalis within this administrative area.
Geographic features and populated places may cross administrative borders.