Barranco de Alpan is located in Sierre de Guara natural park, in Aragon province of Spain. Less interesting that Barranco de Lumos, his neighboring canyon, this barranco work the descent to admire a big colapsed undercut, nice oscuros and estrecho. The canyon requeres a rope of 50 meters or two ropes about 25 meters each. This barranco flow only after a rain period and it is usualy dry most of the year with stagnant photoles.