ALG-466. This big arch about 18 meters span (59 feet) is located on the magnificent sand dune area of Ti-Spad 400 meters north of Streamlined Arch. Roger Frison-Roche (1906-1999) is the famous french mountaineer who has visited several times Tassili in the past. Here is a quote about Tassili from Frison-Roche book "Carnets Sahariens" (1965) : "Ici la feerie de la nature depasse en richesse toute l'architecture humaine, on va d'une merveille à  l'autre; tantot sur nos tetes, d'immenses dragons ouvrent leurs gueules; tantôt des formes humaines petrifiees montent une garde eternelle, en sentinelle au centre d'une clairiere... pour déboucher d'un seul coup par une arche gigantesque et naturelle dans une village fantastique fait de grès.

[Here Nature's enchantment surpasses in exuberance all the architecture wrought by man, you go from one wonder to the next; now immense dragons open their mouths over your heads; now petrified human shapes stand on eternal guard, as sentries in the middle of a clearing.... to opens suddenly by a gigantic natural arch into a fantastic town of sandstone.] By Roger Frison-Roche