Most borders simply didn't exist before mankind claimed the land for their own, drawing lines to divide up and control sections of the earth, so it's not surprising that many of man's borders are unnecessarily complicated.
Borders create enclaves when a country is surrounded by another country, they create enmity when armed guards patrol the border, and they ultimately create confusion when people can't figure out in which country their feet lie.
WonderWhy has created a two part video series that explores the wild and wacky world of complex international borders, it's enough to make you want to declare a treaty just so you don't have to figure it all out!
-Via Curiosity