The Via Amerina has its origins from the Baccano Valley, while the segment in Viterbo begins from Ponte di Valle Romana, from the SP 37 road towards Mazzano Romano (1.2 km.) where one can park the car and then proceed on foot northwards on a dirt road for approximately 1400 metres. After overcoming a farmhouse on the left, one crosses the Stramazzo ditch and climbs the Grezzano hill; after 200 m. come the remains of the via Amerina basaltic flagstones; the pavement is visible for about 1 km. until it reaches an open field, following an ancient basalt quarry.

Moving northwards, after 200 m. comes the Pasci Bovi pit; it is overcome using the medieval bridge and then climbs upwards again; following the flagstones, up to the town of Cascinone.

The trail, which runs parallel to the SP 38 Settevene road (to be crossed twice), after 1400 m. reaches the Umiltà Hamlet, with its S. Maria dell’Umiltà church (frescoes) and remnants of the ancient road. A deviation leads to Calcata and Faleria (itineraries 1 and 2). After crossing the Umiltà area, the road goes down towards a flagstone stretch in the vicinity of the Cerreto pit; to the left, remains from the Ponte Nepesino Castle (Itinerary 3), with its ancient hamlet and bridge, while eastwards stand the mineral water springs (Terme dei Gracchi). After crossing the bridge, Via Amerina climbs in parallel to the route of the provincial road. After 500 m., the connection with the local road for Castel d’Ischia (itinerary 4), with a view over the Nepi plateau; for safety reasons, reaching Nepi is planned through I Cavoni and leaving the provincial road behind.

The local road should be followed, which is initially paved and then becomes a dirt road, towards the Massa plateau. After having travelled 1450 m., turn left, towards a telephone antenna, after which you will reach the tufaceous ridge up to the I Cavoni clearings, which climb down into the ravine of the Massa pit. Crossing the pit, it then climbs back up again and enters inside the city of Nepi, through the Nica Gate, with the remains of an ancient Roman paving.