Kotor: Blue Cave, Mamula & Our Lady of the Rocks Speedboat

★★★★★★★★★★ 4.80 (683 reviews) 90% rated it 5 stars

Free cancellationTravelers' pick

1/12

Duration3h

GroupUp to 20

LanguagesEN

Mobile ticketAccepted

Three hours in Kotor Bay: swimming the Blue Cave, then two islands with real history

You swim into the Blue Cave from the speedboat, stop to see Mamula Island's 19th-century prison and the WWII submarine tunnels, then visit the man-made islet of Our Lady of the Rocks with its church and museum. The 3-hour tour includes bottled water and covers the full Kotor Bay coastline; you'll need to be comfortable swimming in the Adriatic to reach the cave.

Step-by-step itinerary

Explore Kotor Bay and nearby islands

Trip along Kotor Bay coastline
Swim into the Blue Cave
Stop near Mamula Island
Visit submarine tunnels
See Our Lady of the Rocks island

The Experience

The speedboat was supposed to leave at 9am, but the captain was still checking the engine at 9:15, and honestly that's when I realized this wasn't going to be a polished resort experience — it was going to be the real thing. Once we pushed off from the dock, though, the Kotor Bay opened up in front of us, and the 1 hour 10 minute run to the Blue Cave gave us time to see what we'd come for: fishermen's villages clinging to the cliffs, old stone houses, the kind of coastline that doesn't photograph the way it looks in person. The water was so clear you could see straight down, and the captain pointed out the vegetation on the slopes without making a speech about it.

The Blue Cave itself is smaller than you'd think, but the light inside it — that electric blue reflection off the water — is real. Here's the thing though: the speedboat doesn't go in. You swim from the boat to the cave entrance, which means you need to be comfortable in the water and okay with a short swim in the Adriatic. The cave has two entrances, one wide and low, one narrow and tall, and depending on the swell that day you might go through one or both. It's a good spot for photos if you bring a waterproof camera, and the water is cold enough that you feel alive but not so cold you can't stay in for a few minutes.

After the cave we stopped near Mamula Island, a small circular islet about 3.4 nautical miles from Herceg Novi, where a prison was built in 1853. You don't land on it — you just float there and look at the stone structure, and the captain told us a bit about what it was used for. Then we moved on to one of the submarine tunnels from World War II, carved into the rock to hide and repair submarines. It's strange to float above something that old and that specific, knowing exactly what it was built for and when. Our Lady of the Rocks came last, a man-made islet built up from rocks and sunken ships, with a Roman Catholic church on it and a small museum. You can see the navigation light at the western end, and there's a gift shop if you want to grab something before heading back.

The whole trip takes 3 hours, and you get bottled water included. Bring a swimsuit, a towel, and sunscreen — the sun bounces off the water and you'll burn faster than you think. The bay is protected enough that even if the weather looks uncertain on shore, the water is usually manageable, though the captain will make the call on whether conditions are safe enough to swim.

What’s included

The tour includes bottled water. You'll travel by speedboat through Kotor Bay, swim to the Blue Cave, stop near Mamula Island to see the historic prison, pass the WWII submarine tunnels, and visit Our Lady of the Rocks island with its church and museum.

Good to know

Easy physical levelPublic transport nearbyNot for pregnant travelers

Operated by Sea Dog Speed Boat Tours

Is this one for you?Right for anyone who wants to see the Kotor Bay's main sights in one morning without renting a boat or arranging separate transport — the speedboat handles the logistics, and the 3-hour window fits around the rest of your day.