"La Cianola de Marsure" is a small but interesting canyon located in the Midella torrent. Inside there is a beautiful waterfall, the eroded rocks are conglomerates.
To reach it from the Alpine church just go down the CAI 919 path and just before reaching the riverbed, on the right there is a slightly inclined track, be careful, which deposits on the torrent. At this point going up the stream you enter the narrow canyon.
Worth a visit.