The bay is shaped like two big letter Cs joined together. Ships sail in past dramatic cliffs and find the water growing calmer and calmer the deeper they go. On clear days the mountains reflect in the surface like a giant mirror, and the water shimmers every shade of blue and green.
Kotor town at the far end of the bay has walls that climb all the way up the hillside behind it. Inside the walls, the streets are so narrow that two people with umbrellas can barely pass each other. The town is so well-preserved that it is a UNESCO World Heritage Site, which means the whole world has agreed it is special enough to protect.
The bay has been busy with boats for thousands of years. Ancient sailors, medieval merchants and modern holiday-makers have all arrived by sea. Tiny fishing villages dot the shoreline, their boats bobbing gently on the clear water. On a summer evening, when the mountains go pink and the lights of the villages switch on one by one, the bay looks like something from a fairy tale.