They are traversed by the Pontebba or Pontafel Pass, through which passes one of the principal Alpine roads from Italy to Austria.
Railway communication in Venetia is fairly good; there is a main line from Milan to Mestre (the junction for Venice) and thence to Trieste by a line near the coast, or by Treviso, Udine and Pontebba (Pontafel) into Austria.
To the west the limit will then be the Col de Tenda (6145 ft.), leading from Cuneo (Coni) to Ventimiglia, while on the east our line will be the route over the Radstadter Tauern (5702 ft.) and the Katschberg (5384 ft.) from Salzburg to Villach in Carinthia, and thence by Klagenfurt to Marburg and so past Laibach in Carniola on to Trieste; from Villach the direct route to Trieste would be over the Predil Pass (3813 ft.) or the Pontebba or Saifnitz Pass (2615 ft.), more to the west, but in either case this would exclude the Terglou (9400 ft.), the highest summit of the entire South-Eastern Alps, as well as its lower neighbours.
Hence the passes that can be shown to have been certainly known to them are comparatively few in number: they are, in topographical order from west to east, the Col de l'Argentiere, the Mont Genevre, the two St Bernards, the Spliigen, the Septimer, the Brenner, the Radsta.dter Tauern, the SOlkscharte, the P16cken and the Pontebba (or Saifnitz).
Still more recently the main alpine chain has been subjected to the further indignity of having railway lines carried over it or through it-the Brenner and the Pontebba lines being cases of the former, and the Col de Tenda, the Mont Cenis (though the tunnel is really 17 m.
2,897 Saifnitz or Pontebba Pass (Villach by Tarvis and Pontebba to Udine), railway.