The Bay of Kotor is called Europe's southernmost fjord, yet no glacier ever shaped it. It is a ria — a river canyon drowned when the rising sea flooded an ancient valley — a twisting, 28-kilometre inlet of four bays linked by narrow straits, walled in by karst mountains that climb almost straight from the water toward Orjen's 1,894-metre summit. Stone towns ring the shore, and their story is written in fortifications: Venice ruled here from 1420 to 1797 and rebuilt Kotor's walls into a 4.5-kilometre circuit that runs from the sea up the mountainside to St John's Fortress, 260 metres above the roofs. At the bay's tightest point, the 340-metre Verige Strait, a chain was once stretched across the water to bar enemy ships — the name Verige still means 'chains.' UNESCO protected the whole region in 1979.
The climb rewards effort here: 1,350 stone steps switchback up San Giovanni hill, and from the fortress the four bays unfold below like a flooded map, red roofs shrinking to specks. Down on the water off Perast floats Our Lady of the Rocks, an island with no natural ground at all — sailors raised it stone by stone after two of them found an icon of the Madonna on a reef on 22 July 1452, and every year on that date a flotilla still rows out at sunset to add more stones. In the Baroque town of Perast, captains' palaces and bell towers face water so sheltered that on still mornings the mountains lie mirrored on its surface. Today the bay is one of the Adriatic's busiest summer stops — cruise ships thread the straits and Kotor's lanes fill by midday — so the deepest quiet belongs to early hours and the shoulder months.