Southern department of Ardèche harbor many karstic landforms (called lapiaz in french) which formed maze of rocks like the surrounding area of Gorges du Chassezac near the village of Les Vans. Most of the natural arches located on these karstic labyrinth of limestone are expanded crevice, narrow crack through rocks or natural tunnel of irregular shape and sometime badly proportioned. These karstic landforms shelters also an abundance of joints and faults which are not considered like a natural arch. The opening found on these karstic sites are not always photogenic and difficult to highlight through dense vegetation. Some best examples are represented below.
 
These three natural arches below are situated on the rim of Gorges du Chassezac near the village of Maison Neuve in Ardèche department of France. Each of them have at less 2 meters span or height.





                       

This natural arch about 2.5 meters is located on Les Chambrettes locality (a vast karstic area covered with wood) near the hamlet of Notre-Dame de Bon-Secours in Ardèche department of Fance.

                       

                           Two other examples of karstic arches on Les Chambrettes locality.



                       


This natural arch about 1.7 meter of height is located close to the hamlet of Les Divols in Ardèche department of France.

                       


This natural arch is located on the cliff above La Ligne river near its confluence with Ardèche river in Ardèche department of France. The opening has an estimated height of 5 meters.



                          


These 4 natural openings below included a natural tunnel with an arch at the middle are located on the karstic area of Ranc du Boeuf near the hamlet of Bourbouillet in Ardèche department of France. Aven du Reméjadou (an open well overhanging a subterranean river) is also located in this area covered by white oak trees and outcroping mossy rocks.

                          

                          

                          

                          




The karstic area of Ranc des biols is an extension of the one of Ranc du Boeufs (see above) near the hamlet of Tourneuse. A nice arch of 7.5 meters of height is hidden on these karst among others smaller.