Circuit de l'Iseran - Maurienne
In the northern French Alps.
Circuit de l'Iseran is a long day ride
It's about 230kms and crosses two major passes, the Iseran and the Roselend.
Before the Iseran is reached there is a very long (120km) drag to the foot of the mountain, with just two or three small climbs.
Now see:-
Circuit de l'Iseran on the Iseran

Or view another Alpine event,
La Marmotte or
Le Mercantour
Dolomite Marathon