Tolminska troughs are long 200 m wide, from 5 to 10 m. At the left bank of the river Tolminke comes less karst spring with thermal springs, which have an average of 19 degrees Celsius. At sotočju River Tolminke and Zadlaščice, but there is also the lowest point for Triglav National Park, only that at this site is 180 m. Near Tolmin basins there are also slightly Zadlaščice troughs, where you can see the rock wedges in the form of triangular. As the rock resembles the head medvedjo, it got its name bears the head. Slightly above the river basins and Tolminke Zadlaščice, but is also Zadlaška oz. Dante Cave, which has a web intrench long 1140 m..