Cwmythig Hill is situated just off the B4518, approx 2 miles North of Rhayader on the St Harmon road.

To locate Cwmythig Hill, you can use the following Google Maps coordinates: Latitude 52.32720449519187, Longitude -3.494110584259033. In Degrees, Minutes, and Seconds (DMS), the coordinates are 52° 19′ 37.9362” N and 3° 29′ 38.7981” W. You can input these values into Google Maps for precise directions to Cwmythig Hill.