FR-6. The beautiful Baousse del Biel (a local name for humpback old) is located on the rim of Causse Méjean above Gorges du Tarn near the hamlet of La Bourgarie in Lozère department of France. The arch is located by red star on IGN topographic map Top 25 number 2640 west Gorges du Tarn (pleat C2). This natural arch is one of the largest opening of France with a measured height of 26 meters and a span of 30 meters.