Mamula Island (Lastavica), Montenegro: Complete Guide to the Fortress at the Bay's Gate

Mamula sits at GPS coordinates approximately 42.4456° N, 18.5250° E — between the Luštica Peninsula (Montenegro) and the Prevlaka Peninsula (Croatia), at the point where the Bay of Kotor opens into the open Adriatic. It is approximately 6.3 km from Herceg Novi and roughly 25–35 minutes by speedboat from Kotor. Under Venetian rule the islet was known as Rondina; its most consistent historical role has been military, commanding the mouth of the entire bay.

The island is reachable only by boat — there is no public ferry. Options: the Blue Cave speedboat tour from Kotor (Mamula is a pass-by stop); private boat charter; or hotel transfer for guests of the Banyan Tree Mamula Island. Day visitors can book the hotel's restaurants and bars without an overnight stay, and the memorial gallery is publicly accessible.

The circular stone fortress was built in 1853 on the orders of Austro-Hungarian general Lazar Mamula (1795–1878), a military engineer of Serbian descent who was ennobled as Baron von Mamula, served as military-civilian governor of the Kingdom of Dalmatia (1859–1865), and rose to field marshal. The fortress was designed to guard the bay's entrance against naval threats, as part of a defensive triangle with Fort Arza (Cape Arza, Luštica Peninsula) and the Oštro fort (Cape Oštro, Prevlaka Peninsula, now in Croatia) — together known as the Primorska Fortress of Boka, the Austro-Hungarian monarchy's second most important Adriatic naval base.

It is widely repeated — and accurate — that not a single cannon was ever fired in anger from Mamula. Advancing military technology rendered the fort obsolete relatively quickly. Fort Arza is visible from the water on the speedboat approach to Mamula; Fort Oštro sits on the Croatian side, also visible from the boat.

Italian fascist forces of Mussolini's Kingdom of Italy converted the fort into Campo n. 11 — a concentration camp that operated from around March–May 1942 until 12–14 September 1943, when Italy's armistice on 8 September 1943 ended Italian occupation. 14 September is the annual commemoration day.

Based on Italian military documents, estimates hold that more than 2,000 people were imprisoned at Mamula and at least 130 were killed or starved to death. Prisoners were antifascists, POWs, hostages and civilians — including women, children and the elderly — from Boka Kotorska, eastern Herzegovina and southern Dalmatia. The first arrivals were women and children from the villages of Gornji Morinj and Pobori near Budva, taken in reprisal for the 13 July 1941 Montenegrin anti-fascist uprising.

Deaths came chiefly from starvation, plus execution by firing squad, disease (lice and typhus), torture and cold. Concrete records show 68 prisoners were shot in a "first series" and 58 sets of remains were exhumed in 1959.

On the standard 3-hour Blue Cave speedboat tour from Kotor, boats slow near the fortress so the skipper can tell the island's story — the 1853 fortress, the WWII camp, the hotel controversy — before continuing to the submarine tunnels and the Blue Cave swim. Visitors consistently find Mamula both fascinating and unsettling, noting the contrast between the natural beauty and the dark history. Many say the skipper's narration is the single most memorable moment of the tour.