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Col de l'Iseran (el. ) is a mountain pass in France, the highest paved pass in the Alps. A part of the Graian Alps, it is situated in the department of Savoie, near the border with Italy, and is crossed by the D902 roadway. The pass is part of the Route des Grandes Alpes. It connects the valley of the Isère (''Tarentaise'') and the valley of the Arc River (''Maurienne'') between Val-d'Isère in the north and Bonneval-sur-Arc in the south. The north side of the pass road is well built with a number of galleries and tunnels, with a maximum grade of 12 percent. On the northern side are the popular ski resorts of Tignes and Val-d'Isère. The pass is only accessible by road during the summer months. In the winter it falls within the Espace Killy ski area and is easily accessed by a series of pistes and ski lifts. The Col is also accessible by off-road mountain paths and is the highest point both of the Alpine GR5, a long-distance trail from Lake Geneva to Nice, and of the similar Grande Traversée des Alpes. The steep descent to the south, notable for its waterfalls, enters the Vanoise National Park here. ==Details of the climb== From the north the road goes up and down and through tunnels past the lake of Tignes. Starting from Bourg-Saint-Maurice, the climb to Col de l'Iseran is . Over this distance, the road (D 902) ascends , at an average grade of 4.1%. The last starts at Val-d'Isère and climbs at a consistent average of 6%.〔(【引用サイトリンク】url=http://www.climbbybike.com/climb.asp?Col=Col%20de%20lIseran%20&qryMountainID=16 )〕 From the south, the climb starts at Lanslebourg-Mont Cenis and is in length, ascending at an average grade of 4.2%.〔(【引用サイトリンク】url=http://www.climbbybike.com/climb.asp?Col=Col-de-lIseran&qryMountainID=15 )〕 The final starts at Bonneval-sur-Arc and rises at an average gradient of 7.3%, with several sections in excess of 10%.〔(【引用サイトリンク】url=http://www.climbbybike.com/climb.asp?Col=Col-de-lIseran&qryMountainID=14 )〕 On both sides of the Col de l'Iseran mountain pass cycling milestones mark the distance to the summit, the current altitude, and the average slope in the following kilometre. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Col de l'Iseran」の詳細全文を読む スポンサード リンク
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