Col de la Pierre Saint-Martin

The D132 rises 24.7km through wooded valleys and open mountainside, gaining 1,427m to 1,763m. The average gradient of 5.8% disguises ramps of 12.1% — the kind of gradient that turns plans into prayers. 18 hairpins punctuate the ascent, offering brief respite in the corners before the gradient bites again. The road reaches 1,763m — high enough to feel the altitude on tired legs. Located in Aquitaine, France.