Chamonix, France
The world's most prestigious ultra — a loop around Mont Blanc through France, Italy, and Switzerland. Massive vertical gain with sustained alpine terrain and unpredictable mountain weather.
| Name | Mile | Elevation | Crew Access | Drop Bag | Cutoff |
|---|---|---|---|---|---|
| Les Houches | 5 | 3,380 ft | Yes | No | — |
| Saint-Gervais | 12.4 | 2,625 ft | Yes | No | — |
| Les Contamines | 19.3 | 3,770 ft | Yes | Yes | — |
| Col du Bonhomme | 25.5 | 7,645 ft | No | No | — |
| Les Chapieux | 29.2 | 5,085 ft | Yes | No | — |
| Lac Combal | 37.3 | 6,560 ft | No | No | — |
| Courmayeur | 49.7 | 3,937 ft | Yes | Yes | — |
| Rifugio Bertone | 53.4 | 6,070 ft | No | No | — |
| Arnuva | 62.1 | 5,085 ft | Yes | No | — |
| Grand Col Ferret | 65.8 | 8,200 ft | No | No | — |
| La Fouly | 71.4 | 5,250 ft | Yes | No | — |
| Champex-Lac | 79.5 | 4,790 ft | Yes | Yes | — |
| Trient | 87 | 4,430 ft | Yes | No | — |
| Vallorcine | 92.5 | 4,265 ft | Yes | No | — |
| La Flégère | 99.4 | 5,900 ft | Yes | No | — |
| Segment | Miles | Terrain | Difficulty | Notes |
|---|---|---|---|---|
| Chamonix to Les Contamines | 0–19.3 | rolling | moderate | Early energy conservation is critical. |
| Les Contamines to Courmayeur | 19.3–49.7 | climb | extreme | Massive cols. Night section for many. |
| Courmayeur to Champex-Lac | 49.7–79.5 | mixed | hard | Grand Col Ferret is the crux. |
| Champex-Lac to Chamonix | 79.5–106 | mixed | hard | Stay mentally sharp for the final climbs. |
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