Demanding mountainbike route starting in Bad Sachsa through the southern Oberharz and via Ravensberg, Stöberhai and Grosser Knollen The tour starts with a small round around Bad Sachsa and then leads along an ascent to the peaks of the mountains Ravensberg and Stöberhai, from where wide views to the southern Harz foreland, southern Oberharz and mountain slopes of the Hochharz are possible. The tour continues through the southern Oberharz to the Nationalpark Harz in the Hochharz. The northernmost point of the route is the beautiful water reservoir Oderteich, which was builded in 1722 for historical mining and is now Germany's oldest water reservoir. From here the route leads around the Rehberg (893m high) and then over mountain meadows around the town of St. Andreasberg into the Siebertal valley. The summit of the mountain Grosser Knollen (687m high) is reached after about two thirds of the tour. The route then leads with a descent to Bad Lauterberg and along the lake 'Wiesenbeker Teich' and the little water reservoir 'Steinaer Talsperre' back to Bad Sachsa.