(S) Take the GR®5, signposted with a solid Red Rectangle pointing due south. Follow the Route des Crêtes and, via a virtually flat path, reach the Markstein ski resort.
(1) Continue on the GR®5, running parallel to the Route des Crêtes; after the Hundskopf summit, you’ll reach a crossroads of paths at the edge of the forest.
(2) Turn right, still on the GR®, and head away from the Route des Crêtes. Continue on an almost flat path to reach the Col du Haag.
(3) Turn right onto the path marked with a Yellow Cross. Now begin the long final descent, enter the woods and you’ll soon come to the Oberer Sattel shelter.
(4) Continue along this path until you reach the village of Altenbach.
(5) Cross the village, stay on the Yellow Cross markings, join the D13b9 and follow it to the left up to the 721-metre mark at a left-hand bend.
(6) Turn right, following the Yellow Cross markings, and descend to the ponds and the picnic area.
(7) Cross the road to rejoin the same path on the other side of the stream. You’ll soon reach this road again. Shortly afterwards, the path crosses the D13B6.
(8) Cross it again, enter the village of Willer-sur-Thur, and continue on to reach the station (E), the end point of this 5-day walk.