A large part of the dolomite rocks, limited by the joint system, slid and tilted on the marly layer underneath in the direction of the valley and opened up a narrow passageway high above the valley of the river Sauer near Steinheim, the Alkummer.
The hiking trail R8 passes by the Alkummer.
![](https://www.naturpark-mellerdall.lu/wp-content/uploads/2021/06/Rosport_2_Alkummer_DSCF6544-1024x768.jpg)