A spectacular run alongside one of Frances deepest gorges, the middle bit on the edge of the gorge has to be treated with respect, its a very long way down if you go over the barrier, bring a parachute. The bits that arent on the edge of a cliff, particularly the west end where you run down through a series of superb corners towards teh bright blue lake are great for a bit of scratching. The bridge in the middle across the gorge is well worth stopping on, just stay away from the edge. Highly recommended