Heol-Y-Mynydd from River Dulais

At just 1.6km, Heol-Y-Mynydd from River Dulais is short but deceptively intense — 120m of elevation packed into a brief, breathless effort. The average gradient of 7.3% disguises ramps of 15.9% — the kind of gradient that turns plans into prayers. It's over before the legs know what happened — a short, explosive effort where momentum is everything. Located in Wales, Wales.