Aven du Mas de Cournon n°1

Entrance of 1.8 x 1 m opening onto a pretty shaft with mossy walls. The shaft continues quite vertically and emerges at -28 into a fine gallery. At a ledge at -9, a narrow passage followed by a narrow 3 m drop allows access to a few small decorated chambers. To the side, near the base of the entrance shaft, a window gives access to a 9-metre shaft at the bottom of which a squeeze gives access to a 4-metre drop. The latter continues as a muddy crawl giving access to a small clay chamber occupied by a large puddle of water and marking the lowest point of the cavity at -44.

Towards the South, one follows a fine, well-decorated gallery. The main gallery is completely blocked shortly afterwards by clay and calcite.

Towards the South, the decorated gallery is intersected by a small lake that must be crossed on the right. Boots essential. The small clay chamber at the lowest point is occupied by a large puddle of water.

At a ledge at -9, a narrow passage followed by a narrow 3 m drop leads to a few small decorated chambers. Towards the South, one follows a fine gallery intersected by a small lake that must be crossed on the right; boots essential. Fifteen metres further on, a chimney gives access to a small upper network about thirty metres long. Towards the North, a chamber occupied by a jumble of large blocks fallen from the ceiling blocks the continuation. To the side, near the base of the entrance shaft, a window gives access to a 9-metre shaft at the bottom of which a squeeze gives access to a 4-metre drop, continued by a muddy crawl.