Due to the number of sites, Powys has been divided into the three historic counties of Brecknockshire, Montgomeryshire, and Radnorshire. If in doubt where to add your site, the Coflein map search
http://www.coflein.gov.uk/en/search/
may be useful.
Located within sight of the nearby stone row, this well-preserved cist - like its neighbour - is not marked upon current OS mapping... forming but one of the Cwmdeuddwr Hill's many, many prehistoric gems just waiting to be discovered.
Located upon the wondrous Ketty Ridge between - significantly, perhaps? - the sources of the Severn tributary Afon Miwl (River Mule) and Afon Tefeidiad (River Teme), these are two pretty substantial round barrows, albeit sadly isolated from the track by barbed wire Why, oh why do they do this? I was able to cross over without any damage/incident, but please bear this in mind.
Coflein reckons:
SO1177085090: "...24m in diameter and 1.0m high, an excavation trench of 1912, which produced a cinerary urn and details of mound construction, is still apparent."
SO1167085040: "... 24.5m in diameter and 1.7m high, excavated in 1926 producing numerous flints, an inhumation and three cremation burials."