Mamula Island: the fortress that became a luxury hotel

A fortress at the mouth of the bay

Sail out of the Bay of Kotor toward the open Adriatic and, just before the water widens, a low circular island appears with what looks like a drum of grey stone rising straight out of the sea. That is Mamula, and the “drum” is a fortress that covers almost the whole island. There is no village, no beach to speak of, and until 2024 no reason to land at all unless you were a soldier, a prisoner, or a curious sailor. Today it is one of the odder stops on a Blue Cave boat trip out of Herceg Novi — a hotel with a past most five-star properties would rather not advertise.

The island sits at the narrowest point of the strait between the Lustica peninsula and the Prevlaka headland, the natural gateway into the Bay of Kotor from the Adriatic. That position is the whole reason the fortress exists: whoever controlled this pinch point controlled access to the bay’s naval anchorages further in, including Kotor itself. It is a defensive logic that goes back to the Venetians, but the structure standing today is Austro-Hungarian.

Why the Austrians built a ring of stone here

After the Congress of Vienna handed the Bay of Kotor to Austria in 1815, the empire set about fortifying its new Adriatic frontier. Mamula fortress was built in 1853 under General Lazar Mamula, the Austrian military governor of Dalmatia after whom the island is named — a detail that already tells you something about who this place was built for and by whom, long before it held prisoners of its own.

The design is a closed circular battery, roughly 50 metres across, with two tiers of gun casemates arranged around a central courtyard and a rooftop platform for additional artillery. A circular plan was a deliberate choice: it let cannon cover the full 360 degrees around the island, so no approach by sea went unwatched. Similar round forts were built elsewhere along the Austrian and earlier Venetian Adriatic coast, but Mamula’s isolation — a fortress that is also the entire island — makes it a distinctive example: not a battery bolted onto existing terrain, but a building that is the terrain.

For most of its Austrian and later Yugoslav military life, the fortress did what coastal batteries usually do: sat mostly idle, occasionally garrisoned, never seriously tested in combat. That changed under Italian occupation.

The camp of 1942-43

When Italy occupied Montenegro during the Second World War, it used Mamula’s isolation for a different purpose. From 1942 to 1943 the fortress operated as a concentration and internment camp, holding several thousand people over its period of use — captured partisans, suspected sympathisers, and civilians rounded up in reprisal sweeps, including women and children. Conditions were severe: overcrowding in unheated stone casemates, minimal food and water, and no real sanitation. Documented accounts from survivors and Montenegrin historical archives record hundreds of deaths from disease, starvation, and exposure during the camp’s operation.

The camp closed after Italy’s surrender in September 1943, when control of the region shifted amid the wider collapse of Italian forces in the Balkans. The fortress then reverted to a largely disused military structure through the Yugoslav era and into Montenegrin independence, its walls intact but its interior stripped and left to weather for decades.

That history is not a footnote. It is the reason the fortress is a listed cultural monument, and it is the reason its recent transformation has been genuinely controversial rather than simply a heritage redevelopment story.

From ruin to five-star hotel

In the 2010s the Montenegrin government granted a long-term concession to a Swiss-Egyptian investment group to restore the fortress as a hotel. The project stalled repeatedly — legal disputes, funding gaps, and construction delays stretched what was meant to be a few years into closer to a decade — before finally opening in 2024 as a members’-style luxury property with rooms built into the old casemates, a restaurant, and a pool deck fitted within the historic walls.

The restoration is, by most accounts, careful in a purely architectural sense: the circular outer wall and much of the stonework survive, and the building reads unmistakably as the same fortress from the water. What draws criticism is not the stonework but the framing. Montenegrin historians, heritage bodies, and descendants of former prisoners argued during the redevelopment that turning a documented wartime atrocity site into a hotel — with, by most visitor accounts, minimal on-site interpretation of the 1942-43 camp — sidesteps rather than honours that history. The debate did not stop the project, and it has not gone away since the hotel opened.

Whatever your view of the redevelopment, it is worth knowing before you book a boat trip that markets Mamula mainly as a scenic photo stop next to the Blue Cave. The fortress you are photographing has a harder story than the marketing usually tells.

Seeing it from a boat: what you actually get

There is no scheduled ferry to Mamula and no public jetty for casual visitors — access belongs to the hotel and to the boat operators it works with. In practice, almost every non-guest sees the island as one stop of several on a half-day or full-day boat tour, typically combined with the Blue Cave a short distance away near the Lustica peninsula, and sometimes with Our Lady of the Rocks further into the bay on longer itineraries.

A typical stop lasts 15 to 30 minutes: the boat circles the island for photographs, and some operators land briefly at an outer terrace rather than taking guests through the restored interior, which stays reserved for hotel guests and diners. Do not expect a guided tour of the old casemates or a museum room explaining the camp period — that is not currently part of the standard boat-tour stop, which is another point critics raise about how the site’s history is handled for the general public.

Boats to Mamula and the Blue Cave depart most reliably from Herceg Novi, around 45 minutes from Kotor via the Kamenari-Lepetane ferry, which is the shortest practical route out of the bay toward the open Adriatic. Some full-day combined itineraries run directly from Kotor or Tivat and simply add the road or sea transfer time onto the boat portion of the day.

a half-day boat trip covering the Blue Cave, Mamula Island, and Our Lady of the Rocks is the most common way to see all three in one outing without arranging your own transport to Herceg Novi.

Getting there from Kotor: the realistic options

From	Route	Time
Kotor town to Herceg Novi	Road via Kamenari-Lepetane ferry	~45 min
Herceg Novi to Mamula by boat	Direct crossing	15-25 min
Kotor direct to Mamula (combined tour)	Road/sea transfer + boat tour	6-8 hrs full day
Tivat to Mamula by boat	Direct speedboat	~40-50 min

If you are staying in Kotor and do not want to organise your own transfer to Herceg Novi, a full-day cruise around the Bay of Kotor with a Blue Cave stop and a pass by Mamula’s fortress walls handles the logistics for you, departing directly from the Kotor area. Travellers based in Tivat have a shorter run: a Boka Bay boat tour departing from Tivat reaches Mamula and the Blue Cave without the road detour through Herceg Novi at all.

For a slower alternative that swaps the fortress stop for more time in the water, some operators run a day trip combining three of the bay’s islands with a fish picnic on board — worth considering if the swimming and food matter more to you than the history.

Is the detour worth it?

That depends on what you are after. As a beach or swimming stop, Mamula does not deliver much — the island is almost entirely fortress, with little shoreline to speak of, and the water around it is no better than what you would find at the Blue Cave itself or off Zanjic closer to Herceg Novi. As a photograph, the circular fort against open water is genuinely striking and unlike anything else in the bay.

Where it earns its place on an itinerary is as a piece of layered, uncomfortable history seen from the deck of a boat rather than walked through on foot: Austrian coastal engineering, an Italian wartime atrocity, decades of abandonment, and a controversial luxury reinvention, all on one small island you can circle in under half an hour.

If that combination interests you more than another swimming stop, build it into a Boka Bay boat tour rather than treating it as a reason to travel to Herceg Novi on its own. If you are weighing a private boat against a group tour to fit Mamula around your own schedule, it is worth reading how the private versus group boat tour options in the bay actually compare on price and flexibility before you book.

Mamula Island fortress: frequently asked questions

What is Mamula Island and why is the fortress shaped like a circle?

Mamula Island sits at the entrance to the Bay of Kotor, between Herceg Novi and the Prevlaka peninsula. The circular fort that covers almost the entire island was built by the Austro-Hungarian army in 1853 to guard the strait; a round plan gave 360-degree fields of fire for coastal artillery, a standard design for island batteries of that era.

Can you visit Mamula Island fortress today?

Yes, but only as part of a boat trip or as a paying guest of the hotel that now occupies the fortress. There is no scheduled public ferry, and you cannot simply turn up by road. Most visitors see the exterior and courtyard on a stop included in Blue Cave or Boka Bay boat tours from Herceg Novi, Kotor, or Tivat.

Was Mamula really used as a concentration camp?

Yes. Between 1942 and 1943, during the Italian occupation of Montenegro, the fortress held several thousand prisoners — civilians, partisans, and their families — in overcrowded, unsanitary conditions. Hundreds died from disease, starvation, and exposure. The camp closed after Italy’s 1943 surrender, and the site’s wartime history is well documented, though it is not the focus of the current hotel’s presentation.

How do you get to Mamula Island from Kotor?

There is no direct route from Kotor town. The practical option is to drive or bus to Herceg Novi (about 45 minutes via the Kamenari-Lepetane ferry), then join a boat tour from the Herceg Novi waterfront. Some full-day Blue Cave and Boka Bay itineraries departing directly from Kotor or Tivat also pass Mamula and pause for photos.

Is the Mamula Island hotel open to non-guests?

The hotel restricts most of the island to paying guests. Boat tours typically circle the island and land briefly for photographs on an outer terrace or jetty rather than a full walk-through of the restored interior, which is reserved for hotel guests and diners with a booking.

Why is the fortress considered controversial?

Historians, former camp survivors’ families, and Montenegrin heritage groups objected to a 2015-2024 concession that converted a documented wartime atrocity site into a five-star hotel with limited on-site interpretation of the camp period. The redevelopment went ahead regardless, and the debate over how — or whether — the fortress should memorialise 1942-43 continues.

How long do boat trips to Mamula Island last?

A stop at Mamula is usually 15 to 30 minutes within a half-day or full-day itinerary that also covers the Blue Cave, Our Lady of the Rocks, or the wider Bay of Kotor. Full-day combined tours from Kotor or Tivat run 6 to 8 hours including the transfer time to Herceg Novi’s departure point.

Is Mamula Island worth visiting from Kotor given the distance?

It works best bundled into a Blue Cave or Boka Bay boat day rather than as a standalone trip, since the return road journey from Kotor to Herceg Novi alone is around 1.5 hours. If the fortress’s layered history interests you more than the swimming stop at the Blue Cave, it is worth the detour; if you only want beach time, other boat trips skip it.