This sector groups the problems of the western part of Rocher du Long Boyau, from the Route Ronde to the Route de Froidoure. Located on a northern slope, they dry poorly after the rain. Access is from the Gorges du Houx car park, for the problems furthest to the east. For those in the center of Rocher du Long Boyau, it may be wise to park at the Faisanderie car park as for Rocher du Long Boyau and Mont Aigu.

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