The Austrian town of Jungholz presents an unusual geographic placement. It’s connected to the rest of Austria solely by a single point. Otherwise it is completely surrounded by Germany.
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Jungholz is an Austrian exclave for all practical purposes. In the strictest technical sense, it’s still attached to larger Austria by a single dot even though the only convenient path to the rest of the nation goes through Germany. I suppose hypothetically someone could climb to the top of the mountain Sorgschrofen and walk between the lands without crossing into Germany. However, I would also expect that few people would go through that trouble just to prove that simple point.
When four borders extend from a single point it is known as a quadripoint. It is also called a border cross: the lines come together to form a cross "†"
Quadripoints are not entirely unknown within secondary divisions of nations. The famous four corners of the United States is an example. A similar phenomenon in exists in Canada with the establishment of Nunavut in 1999. However, it’s rare at the international level. In fact, there are no places where four nations form a quadripoint. Even the Jungholz example involving four borders and two nations is rare, one of only three examples.
There’s an amazing set of photos and maps at a site called The Boundary Cross at Jungholz. It also includes copies of the 19th Century treaties that came to mark this unusual border. If this topic fascinates you (as it does me), take a look!