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.

Kim Bessler submitted the route:

Similar to the nearby Saranac Ultra 6er Challenge.  Jay Whitbourne describes this as follows: