From Seeleiten car park at Riesach waterfall you ascend to Gfölleralm and Riesachsee Lake either via the alpine trail through "Höll" gorge or via a forestry road. Passing by the lake and the alpine chalets of Kaltenbachalm and Berallerhütte at Kotalm you follow trail n° 777 to Preintalerhütte and Waldhornalm mountain refuges.
From the huts you again continue along trail n° 777 which is now also marked as trail n° 702 (Schladminger Tauern High Trail and long-distance trail 02 "Central Alps Trail"). You walk up into the "Äußere Lämmerkar" cirque where you then turn-off left and continue on trail n° 777 further uphill into the "Innere Lämmerkar" cirque. Rocky passages and partially loose rocks characterize the way and over an escarpment you ascend to Kapuzinersee Lake, which nestles inbetween an impressive mountain panorama.
From Kapuzinersee Lake you climb up to Waldhorntörl ridge from where you can reach the neighbouring Lungau area. Directly at the ridge the trail to the summit of Waldhorn branches off left. In the beginning there are some easy climbing passages (UIAA I) up the West ridge, where the trail takes you up to the summit of Waldhorn. The view during the ascent and from the summit is terrific.
For the route back you follow the same route down to Waldhorntörl (there is a route that once was marked, taking you down via the neighbouring summit of Kieseck, which is NOT recommended!). From the ridge we recommend to make a small detour via Klafferkessel. For this purpose you walk down left of the ridge for just a bit and then take the trail over Breite Scharte into Klafferkessel. Often the lakes there are frozen into the summer, which supports the Arctic charakter of the scenery.
From the trail crossing at Klafferkessel you follow trail n° 702 back towards Preintalerhütte. Via Klafferscharte ridge you descend into Lämmerkar ciqures again. Again, the trail leads you through terrain with quite loose surface. Once down in the "Äußere Lämmerkar" cirque you reach the trail crossing 777/702 where you join the route of your ascent earlier that day. From here, take the known route back to Seeleiten car park in Untertal.