Kotor is a coastal town in a secluded part of the Gulf of Kotor in Montenegro. The old Mediterranean port of Kotor is surrounded by fortifications built during the Venetian period. It is located on the Bay of Kotor , one of the most indented parts of the Adriatic Sea. Some have called the southernmost fjord in Europe, but it is a ria, a submerged river canyon. Together with the nearly overhanging limestone cliffs of Orjen and Lovcen, Kotor and its surrounding area form an impressive and picturesque Mediterranean landscape. In recent years, Kotor has seen a steady increase in tourists, many of them coming by cruise ship. Visitors are attracted both by the natural beauty of the Gulf of Kotor and by the old town of Kotor. Kotor is part of the World Heritage Site dubbed the Natural and Culture Historical Region of Kotor. Kotor has one of the best preserved medieval old towns in the Adriatic and is a UNESCO world heritage site. Narrow streets, contiguous houses, bulwarks, churches, cathedrals, squares, carnivals and feasts. It is home to numerous sights, such as the Cathedral of Saint Tryphon in the old town (built in 1166), and the ancient walls which stretch for 3 miles directly above the city. Sveti Ðorde and Gospa od Skrpijela islets off the coast of Perast are also among the more popular destinations in the vicinity of Kotor.