Cefn yr Ystrad is a Hewitt of 617.3 m in Powys. It sits below Waun Rydd, only 7.3 km to the north and 151.9 m higher.
All four of its nearest neighbours lie to the north, so it stands at the southern edge of its group. Its nearest higher summit, Allt Lwyd (653.1 m, 5.2 km north), is a listed top not profiled here. The summit is marked by a trig point.