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9 November 2026

Report: Why shallow coastal bays are so important

Shallow coastal bays are among the Baltic Sea’s most valuable habitats. They serve as nursery grounds for young fish, provide food and shelter for birds, and support rich underwater vegetation that creates habitats for a wide range of species. At the same time, these bays are important to people as places for swimming, boating, fishing and recreation. Yet many of these environments are now under pressure from eutrophication, coastal development and climate change.

We are now publishing the knowledge review Shallow Coastal Bays – Why Are They So Important?, the first in a series of reports summarising key findings and lessons learned from the Thriving Bays research project.

Bringing knowledge together for better decisions

Over several years of research, the Thriving Bays project has investigated how human activities and restoration measures affect shallow coastal bays in the Baltic Sea. Through full-scale restoration efforts and case studies, the project has generated new knowledge about both the challenges facing these environments and the potential solutions.

The knowledge review presents key insights into what characterises these ecosystems, which species depend on them, and why they are so important for both nature and people. It also summarises the vulnerability of coastal bays to various environmental pressures and highlights the importance of establishing a shared vision before restoration measures are implemented.

“These bays are among the most productive habitats in the Baltic Sea,” says Sofia Wikström, researcher in the project.
“By providing a diverse and naturally nutrient-rich environment, they play a vital role in supporting biodiversity along the coast. This is why they are recognised under the EU Habitats Directive as habitats of particular importance that must be carefully managed and protected.” says Sofia.

Helping people understand and protect coastal bays

The knowledge review is intended for anyone interested in learning more about the Baltic Sea’s shallow coastal bays. It has been developed especially for people who live, work or spend time along the coast, as well as for those involved in coastal management, planning and restoration.

“Our hope is that this report will be a useful resource for everyone who wants to learn more about these environments and contribute to their protection and restoration. This includes both people with a close connection to coastal bays and officials at municipalities and county administrative boards who need a stronger knowledge base to support or initiate restoration efforts,” says Linda Kumblad, who leads the work within the Thriving Bays project.
Download the knowledge review here (in Swedish)

Related pages

  • Read more: Thriving bays
    Vik.

    Thriving bays

    The purpose of the Living bays project is to try to show that it is possible to improve the environment in shallow bays and develop knowledge about how it can be done in a cost-effective way.