The Bay of Kotor — Boka Kotorska locally, often just "Boka" — is a winding 28-km inlet of the Adriatic in southwestern Montenegro, ringed by two massifs of the Dinaric Alps: Orjen to the west and Lovćen to the east. It has been a UNESCO World Heritage Site since 1979 as the "Natural and Culturo-Historical Region of Kotor."
The bay is made up of four interconnected smaller bays: the Bay of Herceg Novi at the entrance; the Bay of Tivat, home to Porto Montenegro marina; the quiet Bay of Risan to the north; and the innermost, most dramatic Bay of Kotor, where the walled Old Town sits at the foot of Mount Lovćen.
Its marquee sights — Our Lady of the Rocks, the submarine tunnels, the Blue Cave, Mamula — are scattered across 107 km of shoreline and are largely water-access only. A single speedboat links them in an efficient half-day, which is why a boat tour is the way most visitors choose to see Boka.