Demanding mountainbike route starting in Altenau with lakes, waterfalls, cliffs, Wurmberg mountain and valleys of the Nationalpark Harz The route starts with an ascent to the Schwarzenberg mountain near Altenau and then leads through the Nationalpark Harz to the scenic water reservoir Eckertalsperre. From here the tour goes through the Ilse valley along the wild course of the Ilse river past the 'Ilsefälle' waterfalls. Along cliffs in the Hochharz, the route continues through the small town of Schierke and from there to the Wurmberg, which is the highest mountain in Lower Saxony. After a descent, the route crosses the Oder Valley near Braunlage, leads past St. Andreasberg through the Siebertal valley and then over the Acker mountain plateau through untouched nature. It goes downhill into the Sösetal valley and from there through the Oberharz back to the town Altenau.