Situation: 
At the Grimselpass roughly between Guttannen and the hotel Handegg.
Climate:   Depending 
on the time of day sunny and shady sectors at an altitude of  1000 to 1400 m. From 
October to May the road is closed (winter closure).
Rock:       Granite  
Topo:       
 
 swiss Bloc °1 (GEBRO Verlag),
more 
info and order
Boulder problems
About 342 boulder problems  3 - 8a+
in about 6 sectors
  3 -   5+ :  159
6a - 6c+ :  115
7a - 7c+ :    60
 8a - 8a+ :      7
 
Others: 11
  The sector "Schwarzbrunnenbrücke". A new rockslides covers some of the boulders on this photo. The boulders further to the right are still okay.  | 
              A bridge connects the both parts of the sector "Elfe". A new rockslide covers most of the boulders of this sector now!  | 
        
  The upper part of the sector "Kristallweg"  | 
            
                   A perfect boulder problem in the sector "Kristallweg" (~7a+)  |