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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 · Wales
RoadBwlch y Groes Hellfire Pass
RouteDinas Mawddwy → Llanuwchllyn · 17 miles
Charactermountain,scenic,technical,hillclimb
OpeningOpen year-round; seasonal weather may make the summit challenging in winter
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