driving road

Bwlch y Groes (Hellfire Pass)

One of the highest tarmacked mountain passes in Wales at 545m, linking Dinas Mawddwy and Llanuwchllyn with a brutal 1-in-4 southern ascent used historically by Austin and Standard Triumph to test prototype cars.

WhereDinas Mawddwy, Gwynedd, United Kingdom · Wales

RoadBwlch y Groes Hellfire Pass

RouteDinas Mawddwy → Llanuwchllyn

Distance17 miles · 27 km · ~36 min drive

Charactermountain, scenic, technical, hillclimb

OpeningOpen year-round; seasonal weather may make the summit challenging in winter

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