In Belgium, asphalt roads with very little traffic, in Germany, an 8km gravel road along the Pretherbach. One steep hill to Udenbreth (D). 80% of the route you cycle through the High Fens - Eifel nature park between 400 and 673m.
You already reach Belgian’s highest village, Rocherath (650m), after 2km. This is your last chance to enjoy the views over the folded hills as soon – for a long time – you will be in a dense forested area that doesn’t take account of national borders. The first spots of light in the green are the Oleftal reservoir and the low-lying Hellenthal (D), the only densely populated place on your route. You then follow the Pretherbach upstream through a quiet location. You don’t return to inhabited territory until after your climb out of the brook valley. The busy traffic in the border town of Udenbreth (D) isn’t too bad. The border itself lays at 672m and is also the water separation border between the Rhine and Maas basin. In a mostly descending line you leave the nature park and can once again look down on the far away village centres.
Until the border with Germany, follow the Velotour signs towards 100 > OLEF. The border crossing-point is a narrow path and you should keep right on the Y-junction. The Oleftalsperre can be followed along the northern or the southern bank. At the dam, follow the markings of the EIFEL-HÖHENROUTE via Hellenthal > Unterpreth > Udenbreth. On the T-junction, follow the bike signpost towards Büllingen > 100 >107 > 110 > 97. In Büllingen, immediately after the railway bridge, turn left to the climb the Ravel L45a. At the next level crossing go down to the right 105 > 99 > 100. Please note: in Germany the intermediate signposts are square red signs.