Four well known couloirs all converge into the wide (avalanche prone) Brévent bowl. Three start from the Brévent lift and le couloir Bozon starting from
Planpraz. The following descriptions are from left to right looking up at the
mountain.
-Le couloir de l'Ensa is the most difficult of the couloirs with a
steep, 42 degree, top section. The vertical drop is 1500m with 400m of that in
the couloir itself. The skiing is technically difficult and there is a serious
avalanche risk. The steep narrow sides of the couloir protect the snow from the
wind and the sun in places so this gives frequent and excellent powder - but
beware of the snow conditions being different to the rest of the Brévent area. -Le couloir Bellin runs just under the cable car for 400m then, like
l'ensa, it joins the Brevent bowl with a total descent of 1500m to the valley
floor. It is steep with sections of 40 degrees and a twist in the middle which
requires complex route finding. There is a high danger of avalanche. Windslab
is frequent at the entry to the couloir.
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Off Piste Skiing
-Le couloir Allais is slightly shorter, 300m before entering the Brévent bowl with slopes of 30 -35 degrees. Avalanche risk and wind slab can form
higher up, but it gives fantastic skiing in spring conditions.
-Le couloir Bozon is the most logical way to descend from Planpraz to Chamonix. 1000m of descent via the Brévent bowl.Less
extreme than the other routes but still requires a very high level of technical
skill. There is avalanche danger especially on the upper slopes.