Günterfelsen und Umgebung, Protected granite formation in Furtwangen im Schwarzwald, Germany

Günterfelsen und Umgebung is a small nature reserve in the Winterwald district, about 800 metres south of the Martinskapelle near Furtwangen im Schwarzwald. It protects a group of rounded granite crags in closed forest, shaped by wool-sack weathering. Because of their form the blocks are often mistaken for erratic boulders, though they were not transported by ice; some were quarried in earlier times and hauled northeast along a path still visible in the woods.

The area received its protection status in June 1956 as a nature reserve. Between 1933 and the end of World War II, the site temporarily bore the name Albert Leo Schlageter Felsen before returning to its current name.

In the 1930s and 1940s the rock was used for National Socialist celebrations and renamed Schlageterfelsen in memory of Albert Leo Schlageter; an inscription carved into the rock can still be seen today. The site lies on the Westweg long-distance trail, about 800 metres south of the Martinskapelle.

The area is reachable via several hiking routes, including a roughly 7-kilometer loop from Oberbregenbach with moderate elevation gain. The forest here is walkable throughout the year, but sturdy footwear is necessary because of the uneven rock formations.

The rounded shapes of the granite blocks formed through spheroidal weathering, where water enters through cracks and breaks the stones into shell-like layers. This geological process happens over a long time and creates the characteristic wool-sack-like shape visible here.