Climbing has been limited
The area has been partly closed from autumn 2020 because of a nature protection program (IBR). The Integral biological reserves are protected natural areas without human intervention. It's forbidden to go over any fences and you might get fined doing so.
Park along route ronde (D301) at the crossing with "Route de la Rocher de la Combe".
Follow "Route de la Rocher de la Combe" until the first crossing, turn left and after 15m take a right on the path as indicated. After a few minutes, you will see the first roof on your left.
distance: 650m - red trail
If you want to combine "Mare aux Corneilles" and "Rocher de la Combe", park more South on D301, at the crossing with "Route de la mare aux Corneilles". Walk into that path, take a left onto "Route du Corbeau". 15m after the next crossing, take a right as indicated on the crag map. After a few minutes, you will see the first roof on your left.
distance: 1400m - blue + red trail