This section of the trail starts in Titignano, a medieval embattled hamlet dating back to 1100. The castle has been the private property of the Corsini family for the last two hundred years and it has stayed intact over the centuries. Get out of the hamlet going north-westwards, along a cart-road that goes past the estate Podere Fontana; after 2 km, after a sharp turn to the left, ford the brook and walk southwards among woods and meadows, until you get near to the banks of Corbara Lake. A mule-track will lead you to S. Francesco Caves. Then walk on towards La Roccaccia and C. Castello, where you can enjoy a wonderful view. From here on, you can either go back to Titignano, or go on as far as the ruins of La Roccaccia; the latter trail will also lead you down- hill to the best-known natural caves of this area, the "Grotte della Piana". Their vast maze of galleries stretches over a level area of more than 3 km. The grottos were already inhabited in the Neolithic period. Finally, walk along the Tiber towards the Fosso della Contea, then uphill among woods and meadows, until you get at the end of the trail.