Place: Appelscha (Bosberg) Length of route: The route is 4.4 kilometers long. This route is contiguous with the 17.3 kilometer long route also located near Appelscha. Nature of the route: It is a challenging route where a good warm-up is a requirement. The route consists of technical singletracks with short venetian climes. There are no paved or flat pieces in the route. This route is contiguous with the 17.3 kilometer long blue route of Appelscha. There will then be a route with a total length of over 21 kilometers. Marking: The route is marked with wooden poles with in red the international MTB sign (triangle with 2 rounds). Environment: This route is entirely in the province of Friesland. The route is located in the old, dense dunes of Appelscha. This makes it possible to realize the most amazing tracks, with a high altitude difference for the environment. The highest point of Friesland is located in this part of the Frisian Forests.