Mountain bike route that leaves from Islantilla and takes us through several sections of the Piedras River, reaching its reservoir. Its passage through the La Tavirona Bridge stands out, an iron bridge that was a crossing point for the Huelva-Ayamonte railway line, built in 1931 with remains of an old train car, it is an 80-meter engineering work. The route has some difficulty due to the descents and ascents that it travels.