For something often invisible and more or lessarbitrary, geographic borders have an enormous impact. In the history of the global geopolitical land-grab, innumerable wars have sparked from bits of Earth that have been claimed by more than one—and sometimesseveral—different nations.

Other times, these territory disputes result from political, cartographic, or geographic anomalies, such as the tiny library that operates intwo countries at once, therare four-sided borderat the summit of a mountain, and thejagged international boundary分裂一个小镇像流浪的裂纹。

But sometimes these boundaries simply don’t get agreed upon. Today theremore than 100 contested territoriesaround the world, including a few particularly surprising cartographic feuds. Here are some of the most bizarre territorial face-offs in the world.