Guide to Wales's hills & mountains

Blaen Onneu

Blaen Onneu - Blaenau Gwent

© Alan Bowring and licensed for reuse under this Creative Commons Licence

Blaen Onneu is the 4948th highest peak in the British Isles and the 384th tallest in Wales


541.0 m (1775 ft)


28.0 m (92 ft)

Survey method

Trimble GeoXH 6000


Rock 3m NW of trig point


  • Subdewey

Hill / mountain range

Black Mountains

Nearest town

Tredegar, Blaenau Gwent

Notes & comments

Very flat summit area

Height of hill is 541.0m