Alta Via 3 is a high route located in the Italian Dolomites between Niederdorf in the north and Longarone in the south.

Most hikers walk the trail from north to south, which is the way the route is described in the most guidebooks.

The hike starts in Niederdorf, goes through Monta Piana, where are numerous remnants from fights of First World War.

After that it nearly touches Antelao mountain and continues through San Vito di Cadore toward Monte Pelmo.

From Monte Pelmo the hike continues to Longarone which is the terminus.