Petit Tunnel d'Oyans (Little Tunnel of Oyans) is located on the side of
L'Arche du Balcon d'Oyans up on the cliff above La Combe d' Oyans near the hamlet of Les Ducs in Drôme department of France. The natural tunnel has an estimated lenght of 15 meters. Its opens end at the middle of a sheer cliff and it is equiped for rappel. A solid chain equip the most difficult passage. IGN topographic map Top 25 number 3136 Bourg-de-Péage (pleat D3).
