Mljet Malo Jezero

Malo Jezero — Croatian for "Small Lake" — is the quieter of the two saltwater lakes at the heart of Mljet National Park, in the wooded western third of the island of Mljet in southern Dalmatia. Most visitors come for its larger neighbour and the monastery islet that appears on every postcard, which is precisely why the small lake is worth the short detour: warmer, stiller water, a flat shoreline path and a fraction of the crowd.

A Small Lake That Is Deeper Than It Looks

Malo Jezero covers roughly 0.25 square kilometres, about 24 hectares, yet its maximum depth reaches 29 metres — considerable for a body of water you can walk around in well under an hour. Veliko Jezero, the Great Lake next door, is far larger at around 1.45 square kilometres and drops to more than 45 metres.

The two are joined at a spot known as Mali Most, the Small Bridge, by a channel only about 30 metres long and half a metre deep. Because that connection is so shallow, sea water moves in and out of Malo Jezero slowly and the lake takes on the character of a lagoon rather than an open bay. Veliko Jezero, by contrast, reaches the Adriatic through the wider crossing at Veliki Most and the Soline channel, where the tidal current reverses direction roughly every six hours and can run surprisingly hard for anyone swimming near the bridges.

Sea Lakes Rather Than True Lakes

Neither basin is a lake in the ordinary sense. Both are karst depressions that were flooded as sea levels rose after the last ice age, around 10,000 years ago. For a long stretch afterwards — very roughly between 10,000 and 6,000 years ago — they held fresh water, before the sea worked its way in through fissures in the limestone and, eventually, through the Soline channel. Salinity today sits at about 37 to 38 parts per thousand, marginally below the open Adriatic because of freshwater inflow.

That slow exchange has a practical benefit for swimmers. Water entering the system warms as it passes through the shallow channels and lingers in the enclosed basins, so a dip in Malo Jezero is noticeably milder than the open sea outside the island — comfortable well beyond the peak weeks of summer.

Walking the Shore, and the Monastery Next Door

A level path runs right around Malo Jezero and is popular with walkers and cyclists, while the surrounding Aleppo pine and holm oak forest makes this one of the better corners of the park for birdwatching. Most people reach the lake on foot from the harbour villages of Pomena or Polače, the two main entry points, or from Goveđari, the inland village founded by an agreement between the Mljet monks and settler families in 1793.

The famous islet sits on the other lake. Benedictine monks from Pulsano on Monte Gargano were granted Mljet in 1151 by Desa of Zachlumia, and they built the church and monastery of St Mary on the islet in Veliko Jezero between 1177 and 1198; a document issued by Pope Innocent III records the church's consecration in 1198. Polače, meanwhile, is built around the standing walls of a Roman palace complex from late antiquity.

Visiting Mljet National Park

The park was declared on 11 November 1960 and covers close to 5,300 hectares — roughly a third of the island, plus a marine belt reaching 500 metres out from the shore — which makes it the oldest marine protected area in the Mediterranean. One curiosity of the island's natural history: the small Indian mongoose was introduced here in 1910 by the Austrian forestry service to clear Mljet of venomous snakes, and it is still very much present.

Mljet is reached by boat from Dubrovnik, the Pelješac peninsula and Split, and it is a popular stop for gulet charter guests exploring Dubrovnik, usually combined with a swim in the lakes and a walk over to the monastery.