The final stretch of the Nature Trail is an uncomfortable leg-breaker. The route crosses the river and continues through the Tajo valley to the Fuentemaría stream ravine. The first slope saves the slope of the hill of the hermitage of the Virgin of Alarilla, a strategic hill occupied in other times by a watchtower on the old border between Arabs and Christians. The detour is worth it to enjoy the views of the immense alluvial plain of the Tagus River. The posts continue along the main track and sink again between esparto grass hills and steppe hills to the Higuerillas stream, they cross another slope and fall into the Vallehermoso stream canyon. The exit from the ravine is a steep wall along an impeccable dirt track and finally the sign for the end of the Natural Trail appears on the border with the province of Toledo. The royal canyon continues towards Santa Cruz de la Zarza. The route continues two kilometers along the livestock route and turns to the right along agricultural roads in search of the Tagus valley. In this section there are no milestones or cycling route markings and it is advisable to follow the track.