Vieille Montagne de Saint-Marc

At just 1.7km, Vieille Montagne de Saint-Marc is short but deceptively intense — 93m of elevation packed into a brief, breathless effort. The average gradient of 5.4% disguises ramps of 12.5% — 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 Wallonia, Belgium.