Carnia is spanned by the southern slope of the Carnic Alps, which extend from Passo di Monte Croce di Comelico to sella di Camporosso, where Alpi Giulie begin and rise (on the Italian side) between Fella and the upper Isonzo rivers, and the adjacent Carnic Prealps. The north side of the Carnic ridge sets up the boundary with Austria; on the south it is delimited by the stream Pontebbana, and, on the upper side of Pontebba, by the flow of the Fella. Mount Coglians (m. 2780) is the highest peak of the Carnic Alps. Together with the cluster of Creta delle Cjanevate it forms an impressive horst at the Austrian boundary. Other main peaks of Carnia are: