Port de Larrau from Larrau

The route begins just outside Larrau at 639 m altitude and ascends for 11.8 km nearly continuously with an average gradient of 7.8% reaching 15% at its steepest. The climb finishes at Port de Larrau at 1,566 m elevation. The profile features 88% climbing with 8.6 km above 5% gradient and 4.2 km beyond 10% gradient, indicating a sustained and demanding ascent.

The road surface is 99% paved and mainly on the D 26, a main road covering 11.7 km of the climb, all without cycle lanes. There is a 1% gravel/unpaved section. The longest stretch with no café, shop, or water is the entire climb from 0.2 to 12 km. At the start in Larrau, there are some facilities including a café, restaurant, pub, a convenience store 133 m off the route, drinking water at 0.2 km, and toilets. Nearby points of interest off route include Chapelle Saint-Joseph monument at 4.2 km and a viewpoint at Erroimendy 1350 m at 7.4 km.