Esgairnantau is a part of the Radnor Forest in Powys, Wales, close to New Radnor. The upper half of the area is a large section of rough grazing land with bracken and heath, boggy in the NE part. Coniferous trees were planted on the other half of the land in 1990-91. The open land is upland used for sheep grazing, and some commercial forestry takes place elsewhere. The site was used extensively as an impact area during World War II, and now two bridleways cross the land to provide public access.