The dashed lines through "Derpibooru," which would otherwise be Serbia?
The region to the north, adjacent to "Ponybooru" (Croatia in our world), is Vojvodina, an autonomous province that occupies the northernmost part of Serbia. The other is Kosovo and Metohija, **commonly known as Kosovo** and abbreviated to Kosmet or KiM, another autonomous province that occupies the southernmost part of Serbia.