Submitted by Salomon de Casimacker:

L'itinéraire représente la traversée du Massif du Mont Noir, du Camping du Lac des Rouges Truites jusqu'à l'église de Chaux Neuve en passant par le sommet du massif, il emprunte en majeur partie des routes forestières. Plongé dans les sapins et les prairies Jurassiennes le parcours reste rapide et nerveux mais offre malgré tous de très beaux paysages typiques de chez nous. D'une longueur de 22km et 700m de dénivelé positif cette traversée n'attend que vous !  Attention a la faune sauvage (Lynx, Loup et autre gibier et félin)

Enola Low Grade Trail is a 29.4 mile point-to-point rail trail spanning east to west from Lancaster county into Chester county. Trail heads at the Turkey Hill Trail and the town of Atglen, with several alternate route entry points along the way. Trail is mostly gravel/dirt with very little hills or sharp turns.

https://en.wikipedia.org/wiki/Serra_da_Estrela

100 mile trail from Guadalupe Peak in the south to Carlsbad National Park in the north. The trail starts in Guadalupe Mountains National Park, at the highest point in Texas which is Guadalupe Peak (8751 feet). Some sections of the trail in the Guadalupe Mountains climb and dip over a 60% solid rock grade and are very rugged terrain. Almost 40% of the main trail is double track; 60% is single track when including the Sitting Bull Falls segment of the trail.