Felsberg is a small hammock in the Überherrn district in Saarland, Germany. I spent the weekend there and rode all (!) roads in approx. 90 minutes with a bicycle. Well, there aren't that many roads, but the height difference between Lower Felsberg and Upper Felsberg is roughly 130m (on a distance of 600 m). The basic draft should be fine, next time I'll take an OSM printout with me for the fine details.