L'Arche d'Alliance (Alliance Arch) is located on the lower section of Vallon du Destel (near its confluence with Gorges de l'Ollioules) near the village of Ollioules in Var department of France. The top of the opening give an access to
Château du Diable (Devil Castle) located just above the natural arch. The opening has an estimated span of about 5.0 meters. IGN topographic map Top 25 issue 3346 west Toulon (pleat B4).