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From Bonne take the road on the true left bank of the reservoir which leads up the Arp Vielle meadows, (huts.) It is possible to shortcut some of the hairpins. At Point 2190, (end of the summer road) go towards the ruined Ricci hut and then up to the summit of the Arp Vielle, 2963m.
By the same route
Negative slope values means the track is heading uphill.