Blue signposts (sparse).
(S/E) From the hamlet of La Serre, in Narnhac, take a road running perpendicular to the D54; it is initially a flat tarmac road, then becomes a track leading downhill towards the River Hirondelle.
(1) 50 m before reaching a bridge over the river, turn sharply right down a wide path marked ‘Private property’ but open to the public (signposted). 200 m further on, turn sharply left onto a wide path running parallel to the river.
(2) Cross the river over the stones marked with blue signposts and continue towards the Waterfall des Croûtes: a cave carved out beneath the rock.
(3) Return along the same path to the hamlet of Le Serre (S/E).