“This is a spur trail of the BC-1 Ruta Forestal del Norte route through the wetter north side of Tenerife.”
— Lost Justpastnowhere
This trail branches off of the Pista Barranco de la Arena (Sand Ravine Trail)
and ends at the Arenas Negras recreational area. There may be water at the Arenas Negras recreation area, but don't count on it. It follows a portion of the Canal de Vergara aqueduct, so it offers a long, slow descent (from east to west). Water is in short supply on the island so there are a network of storage reservoirs and aqueducts that crisscross the island. The surface is mostly crushed lava rock.
Because you are high above the Atlantic Ocean, it offers sweeping views of the Atlantic Ocean, including occasional views of the neighboring la Palma island. You may even catch an occasional glimpse of the el Teide summit.
Towards the end when you leave the Pista Canal de Vergara
which parallels the canal, you'll enjoy a steep but short downhill into the Arenas Negras recreational area. Of course, keep this in mind if you are planning to climb back up to the BC-1 Ruta Forestal del Norte