Put on firm shoes and take enough water with you. Refreshment is only after 2 km in a snack bar in Queimadas possible, then not more. Otherwise, flat hike, but with a short climb on the way to Höllenkessel (about 70 meters in altitude). The information of the GPS is not correct. The length of almost 23 km is correct. Flashlight or headlamp due to the many tunnels not forgotten.
June 14, 2019