Depart from San Vincenzo towards the south entering via della Principessa that, in the plains, follows the coast, exploring Rimigliano Natural Park.
After approximately 11 km, you leave the pine forest located in La Torraccia.
After a gentle climb you reach the crossroad for Baratti (12km): turn right, first uphill and then downhill towards the spectacular Gulf of Baratti.
The road passes between the Populonia’s beach and necropolis.
Reaching the small port of Baratti (15 km) turn back to the same road until the intersection with via della Principessa (18 km); at the T-junction turn left, and then immediately right onto the road, which is bounded by high pines, in the direction of Venturina which you will reach after 7,2 km (passing over an obvious viaduct the 4-lane road Aurelia S.S).
Reaching the old Aurelia (25,5 km), turn right until the entrance to the town of Venturina.
After 700 m turn left following the directions for Calidario spa.
Continue past the thermal baths, passing through (around 1 km) the village until an obvious quadrivium (27,3 km).
Here, turn left pedaling uphill for little more than 3 km until an intersection where you continue towards the village of Campiglia di Marittima (31,8 km) that overlooks Val di Cornia.
From Campiglia continue along the fast downhill (around 6 km) until the overpass that crosses the Aurelia S.S. 1 . reaching S.P. 39 “Old Aurelia” (38,7 km) turn right, quickly reaching (a slight downhill slope) San Vincenzo village (40 km).