Mount Château Blanc (, ) is a tall mountain of the Graian Alps in northern Italy. Its summit lies on the boundary between the municipalities of La Thuile, Valgrisenche and Arvier in the Aosta Valley, Italy.
Description Mount Château Blanc stands along the ridge dividing the Rutor Valley in the west from the Valgrisenche to the east and which culminates at Testa del Rutor () to the south-west of the summit.
The mountain's eastern slopes, on the Valgrisenche side, are occupied by the Château Blanc Glacier, whereas the larger Rutor Glacier extends across its western flank in the Rutor Valley.
SOIUSA classification According to the SOIUSA (International Standardized Mountain Subdivision of the Alps) the mountain can be classified in the following way: main part = Western Alps major sector = North Western Alps section = Graian Alps subsection = Alpi della Grande Sassière e del Rutor supergroup = Catena Rutor-Léchaud group = Gruppo del Rutor subgroup = Nodo del Rutor
Ascent The summit is most commonly reached from Planaval at the entrance to the Valgrisenche. The ascent is a popular ski mountaineering route.
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