47°23′46″N 11°15′54″E / 47.396069°N 11.265115°E
The Porta Claudia is a former fortification at the Scharnitz Pass, where the valley of the River Isar narrows near the village of Scharnitz (Tyrol, Austria), on the Bavarian border near Mittenwald. The Porta Claudia – or more precisely the Scharnitz Pass – is the start of the present federal highways, the B 2 (Germany) and the B 177 (Austria).