Jungholz is a small town in the Austrian district of Reutte, Tyrol that is only accessible via Germany. It has a total resident population of 323 people in its 7 km². Its lack of connection has led to Jungholz being included in the German customs area. Letters to Jungholz can be addressed with either a German or an Austrian postcode (D-87491 and A-6691, respectively).
Jungholz forms an exclave of Austria that is connected to the rest of Austria by a single point, which is the summit of the mountain Sorgschrofen (1636 m). As well as housing border post number 110 on the normal international border between Tyrol and Bavaria, a second border starts and, having gone round Jungholz, ends there. There are thus borders extending in four directions from the summit, called a quadripoint. Two Austrian (Tyrolian, Reutte) and two German (Bavarian, Oberallgäu) municipalities meet at that point, starting with Jungholz and continuing clockwise: