Saimaa — a labyrinth of water and islands
North of Lappeenranta the map turns blue, and you have arrived at Saimaa. It is Finland's largest lake, covering roughly 4,400 square kilometres, but the number alone misses the point. Saimaa is not one open body of water — it is an endless maze of thousands of islands, narrow straits, bays and open stretches that unfold one after another like rooms in an old house. The shores are granite and pine forest, the water is clean, and on summer evenings it often lies as still as a mirror.
This is the heart of the Finnish Lakeland and of the Finnish summer itself. Spend a few days here and you understand why the cities empty out in July: everyone is at the cottage, on the jetty, in the sauna or in a rowing boat — and Saimaa is the capital of that way of life.
The Saimaa ringed seal
Saimaa's most famous resident is the saimaannorppa, the Saimaa ringed seal — a freshwater seal found nowhere else on Earth. Trapped in the lake after the last Ice Age, it evolved into its own subspecies. Only about 400–500 individuals remain, making it one of the rarest seals in the world. Your best chance of spotting one is in May and June, when the seals haul out on shoreline rocks to moult.
Watch from a distance, ideally with binoculars or on a guided cruise. Linnansaari and Kolovesi National Parks are the seal's core habitat — and, conveniently, the finest canoeing waters in the country.
Savonlinna and Olavinlinna Castle
The undisputed jewel of the region is Savonlinna, a small town spread across islands in the middle of the lake system. Its centrepiece is Olavinlinna, a fortress founded in 1475 and widely considered the best-preserved medieval castle in the Nordic countries. Three massive towers rise straight out of the strait, and guided tours take you onto the ramparts and into the gun chambers.
In July the castle becomes a stage: the Savonlinna Opera Festival brings world-class productions into the castle courtyard, with a covered auditorium set inside the medieval walls. Book tickets months ahead — the most popular performances sell out fast.
Punkaharju and lake cruises
Half an hour's drive from Savonlinna runs Punkaharju, a narrow esker ridge shaped by the Ice Age, threading between two open lake basins. The road and railway run along its crest, and the views to both sides rank among Finland's official national landscapes. There are marked trails, swimming beaches and the forest museum Lusto.
Getting out on the water is easy: in summer, sightseeing cruises depart daily from Savonlinna and Lappeenranta, typically 1.5–2 hours for around 20–30 euros. Lappeenranta, the gateway to southern Saimaa, adds an 18th-century fortress, a lively harbour market and the entrance to the Saimaa Canal.
Mökki and sauna — the core of summer
You cannot really understand Saimaa without staying at a mökki, a Finnish lakeside cottage: your own jetty, a rowing boat, a shoreline sauna and the low evening sun. Thousands of rental cottages are available, from simple fishing cabins to modern villas. A week in high season typically costs 500–1,200 euros depending on comfort level.
- Book summer weeks in winter — the best waterfront cottages go first.
- Heat the sauna, swim in the lake, repeat. That is the whole idea.
- Try smoked vendace or perch from a local market square.
Practical tips
Trains from Helsinki reach Savonlinna and Lappeenranta in about 3.5–4 hours, some connections with a change in Parikkala. The best time to visit is June to August, when cruises run, the opera festival is on and the water is warm enough for swimming, often above 20 °C. September is quieter and painted in autumn colours — beautiful in its own right. Plan at least three days: one for Savonlinna and the castle, one for Punkaharju and a cruise, and one for nothing but the cottage and the sauna. Hurry is the only real mistake you can make at Saimaa.