Cascades d'Imi-n-Ifri

From the road, the ground appears to fold in on itself. Stone steps descend until the daylight is framed by a vast limestone arch, with birds crossing the opening and the Tissilt River working through boulders below.

Walk the upper viewpoints first, then take the stepped circuit beneath the bridge when the rock is dry and the river is settled. The arch rises about 50 metres above the gorge floor, cut through Lower Jurassic limestone and faced with younger travertine deposited by calcium-rich spring water. Peregrine falcons, white-bellied swifts and kestrels are among 92 recorded bird species, so pauses under the vault reward more than a quick photograph. Extend the outing towards Iouaridene's dinosaur tracks, Boughrart's potters or Demnate's old fabric for a full geosite day. Heavy mountain rain can turn the channel dangerous and winter snow can interrupt the road, so skip the lower circuit after rain, wear gripping shoes, keep back from loose edges and leave every fossil, nest and mineral formation in place.