“This difficult trail allows access to the Montañas Negras Trail from the west.”
— Lost Justpastnowhere
This is a difficult trail, particularly in the uphill direction as the average grade is 10% and there are a few short, steeper sections. You can also expect some obstacles that most people will have to hike around. The surface is all crushed lava rock, but then you are riding on the side of a volcano.
This segment features impressive views of the coast as well as the neighboring islands of la Palma and la Gomera. In late spring, you may experience a beautiful eruption of wildflowers (hopefully not an eruption of the volcano el Teide.)
This trail travels through the lava flow from the 1909 eruption of the el Chinyero volcano which miraculously stopped just short of the town of Las Manchas where you might have parked to access this trail. So you're traveling on rock that is just about 100 years old.