To the south the River Inn forms the boundary of the range from the Niederbach stream near Inzing upstream as far as its confluence with the Gurglbach near Imst. Its western boundary runs along the Gurgltal valley from Imst to Nassereith and over the Fern Pass to Ehrwald. To the north its boundary runs from Ehrwald along the Gaisbach stream and the Ehrwalder Alm into the Gaistal (Leutascher Ache) and continues through Leutasch-Oberweidach and past the Simmelberg to the north to the Drahnbach. The eastern boundary runs along the stream of Drahnbach and over the Seefelder saddle, then downhill along the Niederbach to its confluence with the Inn.