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The BlackMountains are a group of hills in south-eastern Wales, and a small part of Herefordshire, England.
The highest mountain in the group is Waun Fach (811 m); other Marilyns include the Sugar Loaf, Ysgyryd Fawr, Mynydd Troed, Graig Syfyrddin, Allt yr Esgair, Myarth, Mynydd Llangorse, Bryn Arw, and BlackMountain.