Mljet Nacionalni Park

Mljet National Park covers the northwestern tip of Mljet island, part of Croatia's Dubrovnik-Neretva region on the Adriatic coast. It is one of the oldest protected areas in the country — declared a national park on 11 November 1960, making it the region's first institutionalized attempt to protect an island's marine and terrestrial ecosystem together. The park spans nearly 5,300 hectares of land and water, including a 500-metre belt of protected sea along the shoreline.

What can you see inside the park?

The park's centrepiece is a pair of saltwater lakes set inside dense pine forest — Malo Jezero (Small Lake) and Veliko Jezero (Great Lake). Both formed in karst depressions connected to the open sea by narrow channels, so their water level rises and falls gently with the tide, though conditions inside stay far calmer than on the open Adriatic. Swimming, kayaking and pedal-boating on the lakes are the main draw for most visitors, and shaded paths circling the shoreline are popular for walking and cycling.

A small islet sits in the middle of Veliko Jezero, home to a Benedictine monastery reachable by a short boat trip from the jetty at Mali Most, the narrow channel linking the two lakes. The monastery and its adjoining church are among the most photographed spots in the park, and the boat crossing is typically included in the park entrance ticket.

Beyond the lakes, the park protects thick stands of Aleppo pine, Mediterranean maquis scrub, and stretches of rocky coastline with small coves where visitors can swim away from the busier lake shores. The terrain is hilly, and several viewpoints along the trails open onto panoramas of the lakes and the surrounding islets.

How do you get to the park?

The main entrances sit near the villages of Pomena and Polače at the western end of Mljet, where ferries and catamarans from Dubrovnik, Korčula and Lastovo usually dock. A marked path leads from the harbour to the lakes, suitable for walking or cycling, and small electric shuttles run inside the park for visitors who prefer not to walk the full distance. Many travellers visit as part of a day trip by catamaran from Dubrovnik, allowing enough time to see both lakes and the monastery islet before returning the same evening.

When is the best time to visit?

The park operates seasonally, and conditions for touring and swimming are best from May through October, once the lake water has warmed up. July and August are the busiest months, while June and September offer similar weather with smaller crowds and lower accommodation prices in the nearby villages.

How much time should you plan for a visit?

A basic visit covering both lakes and the boat trip to the monastery islet usually takes 3–4 hours. Visitors who also want to swim, rent a kayak, or walk the longer loop around Veliko Jezero should set aside a full day.

Frequently asked questions

Can you swim in Mljet National Park? Yes, swimming is allowed in both lakes and is one of the park's main attractions — the water is warmer and calmer than the open sea.

How do you reach the monastery islet? A small boat departs from the jetty near the Mali Most channel connecting the two lakes; the crossing is short and usually included in the park entrance fee.

Can you visit the park without a car? Yes, the park is well suited to walking or cycling, and many visitors arrive by ferry or catamaran directly from Dubrovnik as part of a day trip.

When was the park established? Mljet National Park was established on 11 November 1960, making it one of the earliest protected areas on the Adriatic Sea.