One of the most popular day trips from Dubrovnik, the bay of Kotor, known to locals as Boka, is a long sleepy inlet off the Adriatic sea in southwestern Montenegro. Often mistaken as a southern fjord, this is actually an extinct river from the old Orjen plateau. Today, it has four separate gulfs and a number of ancient towns, as well as a few newer settlements. The water is spectacular for those who just want a water tour. If you go on land, of special note are Herceg Novi, a twelfth century town at the opening, the fortified city of Kotor and the picturesque city of Perast with its two small islets. There is no bad place to stop, however. With castles and gardens, monasteries, ancient buildings and much more, every moment in this bay is timeless, picturesque and breathtaking.