EntityQ880441· pop 14· linked from 192 articlesBlack MountainsSign in to savemountain range in WalesConnectionsCarboniferousEntityhillfortEntityTwyn LlechEntityBlack MountainEntityYsgyryd FawrEntityLord Hereford's KnobEntityUnited KingdomCountryWalesEntitychurch buildingEntitygeographic coordinate systemEntityInternational Standard Book NumberEntityWelshEntityIron AgeEntitycastleEntitylimestoneEntitylandslideEntitygeologic time scaleEntityDevonianEntitysedimentary rockEntitysandstoneEntityCategoriesBlack Mountains, WalesLandforms of HerefordshireLandforms of MonmouthshireLandforms of PowysMountain ranges of the Brecon Beacons National ParkMountain ranges of WalesSites of Special Scientific Interest in BrecknockSites of Special Scientific Interest in Herefordshire