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Amgueddfa Cymru – Museum Wales
Site Name: Black Hill, Black Mountains
Notes: The location is unclear, they are listed as "Ridge North of Bwlch" however there are a number of Blwchs in in the area and across South Wales. Blean Bwlch is near Mynudd Ddu. Bwlch is also a village near Crickhowell. Around the rest of Bannau Brycheiniog there are Bwlch Duwynt, Bwlch Ddwyallt and Pen Bwlch Glasgwm. Mae safle Bwlch yw ansicr. Ysgifennwyd y safle fel "Ridge North of Bwlch", ond mae llawer o safleoedd o'r enw Blwch o gwmpas Mynydd Ddu a De Cymru. Mae Blaen Bwlch ger Mynydd Ddy, mae Bwlch yw pentre ger Crichhowell hefyd. O amgylch Bannau Brycheiniog mae Bwlch Duwynt, Bwlch Ddwyallt a Pen Bwlch Glasgwm hefyd.