Col de l'Iseran
The highest paved pass in the Alps (2764 m): 13.4 km at 7.3% from Bonneval-sur-Arc, with one short easier stretch and thin air above 2500 m. The road is closed by snow for much of the year.
- Start: Bonneval-sur-Arc
- Length: 13.4 km
- Elevation gain: 977 m
- Average gradient: 7.3%
- Max gradient: 13%
- The Tour first crossed it in 1938; Félicien Vervaecke led over the top, but Gino Bartali took the yellow jersey on the descent and kept it to Paris.
- In 1939 it hosted the Tour's first mountain time trial, from Bonneval-sur-Arc to Bourg-Saint-Maurice, won by Sylvère Maes.
- In 2019 the stage to Tignes was stopped by hail and a mudslide after the Iseran; times were taken at the summit and Egan Bernal took the yellow jersey.
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