Bothnian Sea

Make a quick donation

Bothnian Sea

The Bothnian Sea begins on the northern side of the Sea of Åland, and continues to Kvarken, the narrowest part of the Bay of Bothnia, which is only 70 to 80 km wide. The post-glacially rebounding coastline of Kvarken is Finland’s first natural site on the Unesco World Heritage List. Post-glacial rebound continues to make Kvarken narrower and shallower, and within a couple of thousand years, the water connection is estimated to disappear completely. The deepest point of the Bothnian Sea is nearly 300 m deep, and located close to the coastline of Sweden.

An underwater threshold separates the Gulf of Bothnia from the actual Baltic Sea basin. Nutrient loads in the Bothnian Sea are lower than in the Gulf of Finland or the actual Baltic Sea, and on a Baltic Sea scale, the water can be said to be quite clean. The waters are also less stratified than in the actual Baltic Sea or the Gulf of Finland, and the status of seabeds is relatively good. Bladderwrack, one of the key species of the Baltic Sea’s underwater environment, is plentiful all through the Bothnian Sea. Bladderwrack is also an indicator species for a healthy aquatic environment, as one of the preconditions for thick bladderwrack forests to build up is that the water is clear enough. Underwater bladderwrack forests are an important environment for many smaller animals and fish fry of the Baltic Sea, and also double as an important spawning area for many fish species.

Species richness is similar to that of the Archipelago Sea, and water salinity does not become too low for marine species before the northern side of Kvarken, i.e. in the Bothnian Bay.


Choose a spot on the map and make a donation! With your help, we are realising concrete Baltic Sea conservation operations as well as making sure that the stories of the sea will be preserved for future generations.


Found your own Baltic Sea team and recruit others to raise more for your team’s donation pot. The team could be organised for a holiday collection or corporate donation, for example.

Information about the page

This page is a symbolic indication of how, with the help of the John Nurminen Foundation, the Baltic Sea and its cultural heritage is being conserved. The decrease in nutrient emissions affects the entire area of the Baltic Sea, and your donation cannot be specifically targeted only to your chosen spot to improve water quality. Our cultural heritage work also covers the entire scope of the Baltic Sea. Our wish is to raise awareness about the Baltic Sea’s unique qualities and history to as large an audience as possible, so that people can learn to value and conserve our beloved sea.

In addition, we vow that our work is driven by substantial results and effectiveness. We are unaffiliated: our work is driven solely by the desire to conserve the Baltic Sea.

More on the foundation’s work can be found here

Other support options

If, for you, purchasing a spot does not feel like the right way to get involved in the preservation of the Baltic Sea and its cultural heritage, then go and check out our other options! For example, you can become a monthly donor, make a one-off donation or donate your birthday to the Baltic Sea.
Every one of us can also help the Baltic Sea by shopping and acting responsibly. You can find tips on Baltic Sea conservation here.