Excellent crack going up the upper slabs of the Boston wall
Upper section of the "Mur de Boston". Can be more easily accessed by rappelling from the summit. To join the path, walk to the top of the center talus field and look for a narrow path going towards the lake. Exposed kiking traverse to reach two bolt.
You can also climb the slabs below and make a link up. Head a little left for the top of the slabs to easily locate the chains
Climber going up the crack