The loop trail takes you to caves that are part of Humpleu karst system (the second largest in the country in terms of length) such as Pestera cu Apa Cave on Firii Valley, Sura Mare Cave, Vartop Ice Cave, and through meadows with dolines, sink holes and ponors. The starting point is on DJ108C county road, about 300 m from Cotul Firii (180 degree curve). Cross Firii Valley on a wooden footbridge and in about 50 meters you reach Pestera cu Apa Cave on Firii Valley. From here the trail continues parallel with the valley, upstream, up to an intersection of forest roads. From here the trail enters in the forest, to the left, and the ascending path takes you past two small caves, the entrance to Pestera Mare Cave on Firii Valley and Sura Mare Cave. From Sura Mare you continue to climb on a gentle path, cross a small meadow and reach Marului Meadow, a large and wild meadow. Cross the meadow, climb to a saddle and then turn left and enter the forest. The path takes you to Vartop Ice Cave and then it leads you to Vartop Meadow. From here the trail descends and runs on several forest roads and paths until it takes you back to Pestera cu Apa Cave on Firii Valley.