With a grand total of 109 natural arches (more of them are located either on
Causse Noir area (75 arches) or on northern area of
Causse du Larzac (33 arches), Aveyron is probably the most prolific department of France about natural arch formation (in contest with the department of
Ardèche (336 arches) ,
Drôme (95 arches) and
Isère (70 arches).