L'Occulus de Saint-Luce is located on Montagne de Montlaud (Montlaud Mountain) at the ruins of Saint-Luce church at 920 meters in altitude. It is situated on central Baronnies Mountains near the village of Buis-les-Baronnies in Drome department of France. The opening has 90 centimeters of height (3.3 feet) which is the minimum required to be classified has a natural arch. IGN topographic map top 25 number 3139 west Nyons pleat D9.