Within Mljet National Park, the saltwater lakes of Malo and Veliko Jezero offer unique swimming in sea-connected lagoons fringed by Mediterranean forests. Tranquil and crowd-free even in peak summer.
Srebrena Beach is located within Mljet National Park on the island of Mljet, one of Croatia's most forested and ecologically preserved islands in the southern Dalmatian region. The beach sits on the shore of Malo Jezero (the Small Lake), one of two large saltwater lakes entirely enclosed within the national park and connected to the open Adriatic by a narrow tidal channel. The result is a lagoon-like swimming environment of exceptional quality: the lake water is sheltered from open-sea conditions, typically calm, and reaches temperatures of 25–28°C in summer — several degrees warmer than the surrounding Adriatic — due to the enclosed basin's solar heating. Water clarity is outstanding, with visibility of 10 metres or more.
The beach itself is modest in size — a natural pebble and sandy-bottom shore of roughly 30–50 metres — but the setting is extraordinary. The lake surface is ringed by dense Mediterranean oak and Aleppo pine forest descending to the waterline; the surrounding hills are largely uninhabited. A path circumnavigates both lakes (combined roughly 6 kilometres) and passes the Srebrena area, making it a natural rest stop for walkers and cyclists. Bicycles can be rented at the Polače boat landing, about 3 kilometres from the lake.
Entry to Mljet National Park is charged at approximately 150–200 HRK per adult in peak season, covering access to both lakes, the walking trails, and the rowing-boat service to the Benedictine monastery island. The national park office at Pristanište sells tickets and rents rowing boats for independent lake exploration. A restaurant operates at the monastery on the island in the centre of Veliko Jezero (the Large Lake), reached by rowing boat from the shore.
Access to Mljet is by Krilo catamaran from Dubrovnik (approximately 2.5 hours) or from Korčula, with additional seasonal services from Split. The national park is reached from the main ferry port at Polače or from the western port of Sobra.
Amenities
- natural swimming areas
- boat rental
- restaurant at island monastery
- national park facilities
Good to know
- Best for
- couples, swimmers, wildlife-watchers, photographers, solo
Highlights
- Sheltered saltwater lake (Malo Jezero) warming to 25–28°C in summer — several degrees above open-sea temperatures
- Exceptional water clarity with visibility to 10 metres in the enclosed lake environment
- Mljet National Park forest descends to the waterline, creating one of Croatia's most scenic swimming settings
- Circular lake trail (approximately 6km) passes the beach — ideal for combining a walk with a swim
- Benedictine monastery on the island in Veliko Jezero reachable by rowing boat from the shore
Tips for visiting
- Buy the national park entrance ticket at Polače landing before walking to the lake — the ticket desk may close early outside peak season
- Rent a bicycle at Polače for the ride to the lakes (approximately 3km) and to circumnavigate the trail efficiently
- The lake water warms most by mid-afternoon; the 14:00–16:00 window is typically the warmest for swimming
- Bring food — the only refreshment inside the park is the monastery restaurant on the island, which requires a rowing-boat trip to reach
- Jellyfish (Cotylorhiza tuberculata) appear naturally in the lakes in late August and September but are harmless to most swimmers
When to visit
Mid-June to early September is the main swimming season when lake temperatures reach their peak of 25–28°C. July and August bring the highest visitor numbers, but Mljet remains quieter than Hvar or Brač. The walking trails and lake scenery are superb in May and October even outside the main swimming season.
Accessibility
The path from Polače landing to the lake swimming area is approximately 3 kilometres of partly unpaved track. The terrain is generally flat but uneven underfoot and is not suitable for standard wheelchairs without assistance. No dedicated beach wheelchair or adapted access facilities are known at the lake swimming areas. Bicycle hire at Polače provides the most practical alternative transport for those unable to walk the full distance.
Frequently asked questions
How much does Mljet National Park entrance cost?
Park entrance fees are approximately 150–200 HRK per adult in peak season, covering access to both lakes, the walking trails, and the rowing-boat service to the island monastery. Children under 7 typically enter free; current rates are confirmed at the park office in Polače.
How do I reach Mljet from Dubrovnik?
Krilo catamaran runs between Dubrovnik and the national park port of Polače (approximately 2.5 hours). A daily Jadrolinija ferry from Dubrovnik calls at the island's main port of Sobra (approximately 3 hours). Polače is the closer landing point for the national park area.
Is the lake water different from the sea?
Yes — Malo and Veliko Jezero are connected to the Adriatic by a narrow tidal channel but are largely enclosed, so the water warms faster and stays calmer than the open sea. The lagoons also support specific marine ecosystems including jellyfish populations that appear naturally in late summer.
Can visitors swim in both lakes?
Yes — swimming is permitted in both Malo Jezero and Veliko Jezero. Srebrena Beach on Malo Jezero is the most accessible entry point, but the lake circumference path provides additional places to enter the water.