Blue Cave

The Blue Cave (Plava Špilja) near Luštica Peninsula dazzles with its luminous blue water – a natural wonder best reached by boat.

O n a sunny day, when the sea is calm and the sun is high, the Blue Cave near the tip of the Luštica Peninsula turns into a chamber of pure light. Known locally as Plava Špilja, this sea cave is one of the most popular natural attractions on the Montenegrin coast. Boats from Tivat, Herceg Novi and even Kotor head out to the peninsula, anchoring at the cave’s entrance so visitors can jump into the water and swim inside. As your eyes adjust, the whole cavern seems to glow from within – sunlight filtering through the water and reflecting off the sandy bottom creates an electric blue that feels otherworldly.

The cave is large enough for several small boats to enter at once, and the vaulted ceiling amplifies the sound of water lapping against the limestone walls. The best light is usually between late morning and early afternoon when the sun is high enough to penetrate the entrance at just the right angle. Many excursions combine the Blue Cave with stops at the abandoned submarine tunnels carved into the cliffs during Yugoslav times, a swim off Žanjice or Mirista beach, and a glimpse of the striking Mamula Fortress at the bay’s mouth.

Swimming in the Blue Cave is a surreal experience. The water is deep but crystal clear, making it easy to see your hands glow as you move them through the light. On warm days it’s refreshing and invigorating, and after a few minutes you forget there’s a world beyond the entrance. If you prefer to stay on deck, you can simply lean over the side and watch the colour swirl beneath you. Although the cave gets busy in summer, visiting early or late in the season offers a quieter experience with the same dazzling effect.

The Blue Cave is a moment of magic on Montenegro’s coast – a luminous blue world hidden inside the cliffs of Luštica.