Mljet: the island we almost skipped

The itinerary we threw out

We had a plan. We had, in fact, a very good plan. Two days on Korčula, one day in Ston, an afternoon on the Pelješac peninsula, a full day in Dubrovnik’s Old Town. It was the kind of itinerary that leaves no room for improvisation and almost certainly produces a solid, enjoyable trip that nonetheless feels slightly managed.

What happened instead was this: the catamaran from Split arrived at Korčula two hours late due to weather, we missed our connection to Ston, and in the subsequent conversation with the ferry staff we heard the word “Mljet” for the first time. There was a morning sailing from Korčula town that would have us at Polače — one of Mljet’s two main villages — by mid-morning. We had heard of Mljet in a vague way. We knew it was a national park. We knew it had salt lakes.

We went.

First impressions: green and quiet

Mljet is often called the greenest island in the Adriatic, and on a May morning the claim seemed entirely reasonable. The ferry approaches through a narrow channel — the Soline passage, which separates the western tip of the island from the Pelješac coast — and the density of the pine and holm oak forest right down to the waterline is striking. There are no beach resorts visible, no hotels, no visible development of any kind. Just forest and rock and water.

Polače is a tiny settlement built over and around the ruins of a late Roman palace — the 5th-century walls of a substantial fortified complex are simply incorporated into the village, serving as the foundations and back walls of houses. It is the sort of casual relationship with antiquity that you either find enchanting or mildly maddening, depending on your disposition. We found it enchanting.

The national park entrance is a short walk from the harbour. In May 2019 the entry fee was included in the price of the day-trip boat ticket we had booked the previous evening; if you come independently, you will pay at the gate.

The lakes

The heart of Mljet National Park is its system of connected salt lakes — Malo Jezero (Small Lake) and Veliko Jezero (Great Lake) — which are connected to the sea by narrow channels. The water in both lakes is a deep, almost impossible blue-green that shifts with the angle of light. At 10:00 am in May, with the sun not yet high enough to flatten the colour, it looked like something from a computer-rendered film.

Malo Jezero is small enough to walk around in under an hour. Veliko Jezero is considerably larger, and a path follows its entire circumference through the pine forest — a walk of roughly seven kilometres that takes between two and three hours at a moderate pace. We did half of it before heat and hunger pulled us toward the small café on the lake’s eastern shore.

The water temperature in late May was around 18°C — cold enough to be bracing, warm enough to be pleasant once you were in. We swam for about forty minutes from a flat limestone ledge above Malo Jezero. There were perhaps twenty other people visible from where we were. In July or August, we suspect this would be a very different calculation.

St Mary’s Island

At the centre of Veliko Jezero sits a small island, and on that island stands a 12th-century Benedictine monastery that has been continuously inhabited, in various forms, for most of the centuries since. Today it houses a restaurant — the journey to reach it (a small boat that runs from the lake shore for a few kuna) is half the appeal.

We had lunch there: grilled fish, salad, local wine. The monastery courtyard is shaded by a fig tree of considerable age. The walls are thick enough that even at midday the interior rooms are cool. The boat back to the lake shore takes four minutes. For about an hour and a half we sat in a medieval courtyard on a lake island on a Croatian national park island and understood exactly what the phrase “hard to believe this is real” is for.

What surprised us

We had expected to like Mljet. We had not expected to be genuinely moved by it. There is something about the particular combination of elements — the antiquity, the forest, the colour of the water, the near-silence — that produces an effect greater than any single component.

The Mljet National Park is one of those places that is good at multiple levels of engagement: as a landscape, as a swimming destination, as a history site, as simply somewhere to walk in a forest. We stayed longer than we had intended and took the last boat back to Polače in fading afternoon light, slightly sunburned and very glad we had missed that connection to Ston.

The Mljet National Park day trip from Dubrovnik is well organised and handles the logistics that would otherwise require careful independent planning — particularly the national park entry and the boat to St Mary’s Island. If you are working from Dubrovnik as a base, it is worth the early start.

The honest caveats

Mljet in peak season — July, early August — will be significantly busier than our May experience. The lakes are a finite space, and the image of that improbable blue-green water travels well on social media. We spoke to people on the boat back who had visited in previous Augusts and described queues for the island ferry and considerably less solitude around the lake paths.

The ferry connections from Dubrovnik are also worth checking carefully. The catamaran runs seasonally and not on all days; an organised tour removes this planning burden entirely.

None of this diminishes what the island is. It is one of the most beautiful places we visited in the region, and we would go back in a different season just to see how it changes. We would also, next time, actually plan to be there rather than stumbling in on a mis-timed ferry connection.

Some of the best days are the ones you did not arrange.