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The first Roman road connecting Italy with today's Germany was the Via Claudia Augusta, completed in 46–47 AD, from Verona to the Reschen Pass, the Inn valley and the Fern Pass to Augusta Vindelicorum, today Augsburg.
To the south she falls sharply away and, to the north, ends abruptly in a steep rock face, that towers over the Inn valley near Ebbs.
The regions settled by Upper Bavaria and from the Inn valley, such as the Ehrwald Basin and the tributary valleys of the Lech have similarities with the dialects of the Upper Inn Valley, whilst in the region around Reutte and in the Tannheim valley, a Swabian-Alemannic dialect dominates.
The Central and Northern Alps are separated by the Northern Longitudinal Trough (nördliche Längstalfurche), the line Klostertal - Arlberg - Inn Valley - Salzach Valley as far as Lake Zell - Wagrain Heights - Upper Enns Valley - Schober Pass - Mürz Valley Alps - Semmering - southern Vienna Basin.
A further distinction can be made between the Tyrolean Lower Inn Valley (Tiroler Unterinntal) (as far as Kufstein) and the Bavarian Lower Inn Valley (from Kiefersfelden).
The exception was maintained even after a road was built in 1905 linking Samnaun to Martina in the Inn valley.