Park at Place de l’Église in Sourdon.
(S/E) Leave Sourdon via Rue Duhamel (yellow markings) towards Ainval.
(1) After the left-hand bend, near a farm building, turn right onto a wide grassy path lined with trees.
(2) Pass close to the Chapel of Saint-Aubin, which lies below. Reach the edge of the Bois Saint-Aubin.
(3) Turn left and walk along the edge of the woods.
(4) Turn right to reach the Bois de l'Auge. 100 m further on, at the three-way junction, take the left-hand path which climbs into the woods and emerges towards Esclainvillers.
(5) Turn right and cross the woods. At the exit, continue straight on until you reach the second cross-path.
(6) Head up to the right towards the woods and continue straight on until you reach the Fossé de Saint-Firmin.
(7) At the ditch, turn right along the edge of the woods.
(3) Turn left to head back up towards Sourdon and return to the car park via the same route as on the way there (S/E).