Kvarken Archipelago – Finland’s Rising Coast

Imagine standing in a landscape where new land is still rising from the sea.

On Finland’s west coast, the Kvarken Archipelago is being continuously reshaped by one of the most remarkable consequences of the last Ice Age. The land rises by almost one centimetre every year, gradually creating new islands, connecting existing ones and transforming shallow sea bays into wetlands and eventually dry land.

This constantly changing landscape is so exceptional that the Kvarken Archipelago is Finland’s only Natural UNESCO World Heritage Site, forming a transnational World Heritage property together with the High Coast of Sweden.

Here, we do not simply learn about the Ice Age – we can see its effects continuing around us today.

A landscape still emerging from the sea

Around 10,000 years ago, the enormous weight of the continental ice sheet pressed the Earth’s crust down beneath the region.

When the ice melted, the pressure was released. Ever since, the land has been slowly rebounding – and the process continues today.

In the Kvarken region, the land rises by approximately 8–9 millimetres per year. New land continuously appears from the shallow sea, islands grow and eventually join together, while former bays become lakes, wetlands and forests.

Over the course of a human lifetime, these changes can become visible.

Scientists estimate that hundreds of hectares of new land emerge from the sea in the Kvarken region every year. In the distant future, continuing land uplift will dramatically change the geography of the Gulf of Bothnia.

Svedjehamn – see the traces of the Ice Age

One of the best places to understand the Kvarken landscape is Svedjehamn on Björkö island.

From the Saltkaret Observation Tower, we look across a remarkable pattern of shallow bays, islands and long parallel ridges.

These ridges are known as De Geer moraines. They were formed beneath the continental ice sheet and create the distinctive landscape for which the Kvarken Archipelago is internationally recognised.

Seen from above, the repeating ridges are sometimes compared to a giant washboard stretching through the archipelago.

Nature trails around Svedjehamn allow us to experience this unusual landscape at ground level, walking through forests, wetlands and areas where the boundary between land and sea is continuously changing.

Replot – the gateway to the World Heritage archipelago

Our journey into the Kvarken takes us across Replot Bridge, connecting the mainland with Replot and Björkö.

The bridge offers expansive views across the surrounding waters and islands and provides a dramatic introduction to the fragmented landscape of the archipelago.

Beyond the bridge, villages, forests, shallow bays and small islands reveal how people have adapted to a coastline that has never stopped changing.

Söderfjärden – from meteorite crater to seabed and farmland

Near Vaasa lies another extraordinary landscape – Söderfjärden.

A meteorite struck this area more than 500 million years ago, leaving behind a large circular impact crater.

Much later, after the Ice Age, the crater lay beneath the sea. As the land continued to rise, the shallow bay gradually became separated from the sea and was eventually drained for agriculture.

Today, Söderfjärden is a vast cultivated plain surrounded by the ancient rim of the crater.

In one landscape, we can therefore explore two completely different geological stories: an ancient meteorite impact and the much younger process of post-glacial land uplift.

Vaasa – a city beside a changing coastline

Vaasa provides an excellent starting point for exploring the Kvarken Archipelago.

The relationship between the city and the sea has changed considerably over the centuries as the land has continued to rise. Places once closely connected with the shoreline and maritime traffic now lie much further inland.

The historic surroundings of Old Vaasa and the land-uplift shores around the city help us understand that this geological phenomenon is not merely something visible in untouched nature – it has also influenced settlement, harbours and everyday life along the Finnish coast.

Valsörarna – an optional lighthouse experience

During the summer season, the journey can be extended further into the outer archipelago with a cruise to Valsörarna.

Far from the mainland, these islands offer a very different perspective on the Kvarken landscape. Open sea, rocky shores, birdlife and the historic Valsörarna Lighthouse create a memorable maritime experience at the outer edge of the World Heritage archipelago.

The lighthouse has guided vessels through the Kvarken since the 19th century and stands as a reminder of the long relationship between people and the challenging waters of the Gulf of Bothnia.

Boat excursions to Valsörarna are subject to seasonal availability, weather and sea conditions. Routes and schedules may change, and excursions may be cancelled when conditions do not allow safe navigation.

Finland’s only Natural UNESCO World Heritage Site

The Kvarken Archipelago and Sweden’s High Coast together form a transnational UNESCO World Heritage property.

The two areas demonstrate complementary aspects of the same post-glacial process. Sweden’s High Coast reveals some of the world’s most dramatic evidence of land uplift, while the exceptionally shallow waters of the Kvarken allow us to observe how new islands and coastal landscapes continue to emerge.

For visitors, this makes the Kvarken much more than a beautiful Finnish archipelago.

It is a landscape in motion – a place where geological processes that began at the end of the Ice Age are still visibly transforming the world around us.

Combine your journey with Finland

The Kvarken Archipelago can be experienced as a three-day stay from Vaasa or included in a longer tailor-made journey through Finland.

Vaasa can be reached from Helsinki by plane, train or coach, making the World Heritage landscape easy to combine with other regions of the country.

Add the Valsörarna lighthouse cruise during summer, continue through Western Finland or combine the Kvarken with one of our other nature, architecture and cultural journeys.

Tailor your journey

Our Kvarken programmes can be adapted for nature lovers, photographers, geology enthusiasts, educational groups and travellers interested in UNESCO World Heritage.

Choose easy nature walks and panoramic viewpoints or spend more time exploring the islands and outer archipelago.

We tailor the programme to your interests, travel dates and group size – allowing you to experience one of Finland’s most extraordinary landscapes in the way that suits you best.