Col de Sarenne ) is a mountain pass located in the Grandes Rousses massif, approximately 9 km east of Alpe d'Huez in the Isère department of France. The pass connects Alpe d'Huez with the villages of Mizoën and Le Freney-d'Oisans in the Romanche valley. The road over the pass was used on Stage 18 of the 2013 Tour de France bicycle race as this loops round to enable the cyclists to climb the Alpe d'Huez twice in the same stage.
From Alpe d'Huez, the route used on the Tour de France follows an unnamed road initially, descending to 1,765 m before the final climb to the summit which is 3 km long at an average gradient of 7.8%.
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