The Bay of Kotor, known simply as Boka, is a winding bay of the Adriatic Sea in southwestern Montenegro. The bay, once called Europe's southernmost fjord, is in fact a ria of the disintegrated Bokelj River which used to run from the high mountain plateaus of Orjen.
The bay has been inhabited since antiquity. Its well preserved medieval towns of Kotor, Risan, Tivat, Perast, Prcanjand Herceg Novi, along with their natural surroundings, are major tourist attractions. Natural and Culturo-Historical Region of Kotor has been a World Heritage Site since 1979.