Crazy Vuk's border (Serbian: Међа Вука манитога/Međa Vuka manitoga), sometimes also called Dukljan's border (Дукљанова међа/Dukljanova međa) is remains of a border wall in Montenegro. It follows the line Dubrovnik-Bijela gora (above Grahovo)-Cuce-Čevska planina-Ostrog-Razbijeni vrh (Bijelopavlići)-Donja Morača-Kom.
Serbian poet Matija Bećković wrote a book of poems of the same name.
References
Crazy Vuk's border Wikipedia(Text) CC BY-SA