In Pontebba we leave the Val Canale and enter the Canal del Ferro. We cycle along the main road as we leave the town and, at the cemetery, after a short but steep climb, we return to the grounds of the old Pontebbana railway converted into a cycle path. The Alpe Adria Radweg cycle route continues slightly downhill to the old railway station of Pietratagliata: here the cycle path stops and the cyclists are forced to descend again on the old Pontebbana road facing a narrow passage. You pass some houses and, just outside the hamlet, you need to go up a flight of stairs to return to the old railway track where we find the paved cycle path.
We continue pedaling in the wildest stretch of the Canal del Ferro, characterized by numerous overhanging walls that close the narrow valley of the Fella river: we cross numerous tunnels and some spectacular bridges. The first is that of "Ponte di Muro" which takes us to the other side of the valley. In Dogna all the cyclists stop on the bridge that crosses the homonymous valley to admire the spectacular view of the overhanging walls of the Jof di Montasio. Having passed the Cadramazzo waterfall, at the nth bottleneck of the valley, a singular iron bridge takes us back to the other side. At this point "la Chiusa" rose up until the end of the nineteenth century, the impregnable fortress that gave its name to the neighboring town. In Chiusaforte you absolutely must stop at the station: in the historic building, in addition to the possibility of refreshment, a small museum on the history of the Pontebbana railway is growing day by day.
Beyond Chiusaforte, there are still tunnels dug into the rock and the Rio Belipeit waterfall, while the fortress of Chiusaforte, built in 1904 and currently being restored, stands on the crags that overlook the Ciclovia Alpe Adria. Once in Ponte Peraria, before facing another bridge, cyclists can choose between two options. The first leads to Moggio Udinese, through the villages of Roveredo and Ovedasso, following the directions of the BiciItalia 5 route. The road is paved and with little traffic but you need to measure your strength well due to some sharp climbs. The official route of the Alpe Adria Radweg cycle route goes straight over the bridge, following the old railway line in its entirety until it reaches the village of Resiutta.
Beyond the old railway station of the town, continue on the cycle path built in place of the tracks. In this section we face the two longest tunnels of the old Pontabbana railway and reach the Moggio Udinese station, where at the moment, the cycle path stops (as well as the official CAAR table). Thanks to an underpass we reach the bridge over the Fella where we can choose whether to continue pedaling on the busy state road or reach the interesting village of Moggio, famous for its abbey founded by the Benedictine monks in 1084 and continue along a suggestive military road that bypasses the inhabited area of Campiolo and continues until the end of the valley, in the municipality of Amaro. I always recommend this second option, even if you have to take some dirt roads and easy climbs. At the end of the military road one crosses the Fella for the last time on an old railway bridge (that of the disused Carnia-Tolmezzo-Villa Santina railway) and one arrives in the town of Carnia where we also find the cyclists who have preferred to ride on the road state.
After passing the built-up area at the beginning of the 1900s around the railway station, continue towards Portis Vecchio (an abandoned village following the 1976 earthquake) using pleasant roads with a natural background that run through the meadows, between the railway and the embankment of the Tagliamento river. Unfortunately, even in this section the official scoreboard is missing and this forces many cyclists to continue pedaling along the SS13 "Pontebbana". A few kilometers after passing the "ghost town" of Portis Vecchio you come in sight of the medieval walls that protect Venzone, the only example left in Friuli of a fortified town of the fourteenth century, the final point of this stage.