Leave Sticciano Scalo, taking the S.P. 157 towards Roccastrada, a road lined by a double row of pine trees. After around 5km the road starts to head uphill. After 8.5km the S.P. 157 turns left towards Roccastrada.
Continue uphill for around 5km, with beautiful views towards the coast, until the roundabout in the town of Roccastrada (13.9). From here, the S.P 157 winds uphill for a couple of kilometres. Around 3km after Roccastrada, leave the S.P. 157 and turn left onto the S.P. 8 "Meleta" road towards Sassofortino and Roccatederighi. Head uphill to Sassofortino (560 metres above sea level) and continue along the panoramic road, which goes downhill to Roccatederighi (26). At the next big junction (28.3) turn right onto the S.P. 19 towards Prata, Montieri and Siena.
On the right, just after the junction, is the source of the river Farma. The road continues through greenery for around 8km until Gabellino (36.3) where, at a T-junction, you should turn right onto the S.P. 162 towards Montieri. From here, if you like, you can take a detour to Boccheggiano (2 km and 190 m difference in altitude) or continue for 3.7km until a junction on the left for Montieri (40).