On this page, you can explore some of Stonereefs' installations. Each project represents a collaboration between municipalities, organizations, and researchers working to strengthen marine biodiversity. Each installed reef module tells a story of marine restoration. This overview maps our deployment across key sites, shows our strategic partnerships, and tracks the documented improvements in species diversity and habitat quality we've achieved.
System: REEForm2026 · Hirtshals, Denmark
Nordsøen Oceanarium (partner)
In collaboration between Stonereefs and Nordsøen Oceanarium, purpose-designed lobster habitats have been developed to serve as shelter and nursery environments for juvenile lobsters during their most vulnerable growth stage. The project is part of the conservation effort for the European lobster in the Skagerrak. The lobsters are reared in captivity at Nordsøen Oceanarium and placed early into the habitat modules, where they can develop under protected conditions. The lobsters and habitats are then released to sea together, with the modules also contributing to increased local biodiversity on the seabed.
System: REEFlex2026 · Copenhagen, Denmark
WWF (initiator and client), City of Copenhagen, local primary schools
WWF and Stonereefs repeat the 2025 success with another participation in Harbour Day in Copenhagen. In the project, local 4th-grade pupils design their own artificial reefs, which are then 3D-printed at full scale and installed in Copenhagen Harbour. The aim is to combine practical learning, technology, and environmental understanding through concrete biodiversity projects. The pupils also take part in teaching programmes on marine environments, ecosystems, and biodiversity, and get to investigate underwater life using submersible drones. The project strengthens children's relationship with the marine environment and builds local understanding of the need for marine restoration.
System: REEFlex2026 · Waterford, Ireland
HTL.tech, BAM, Roadstone
Stonereefs, HTL.tech, BAM, and Roadstone are collaborating to re-establish 1,500 m² of marine habitat as part of a major expansion of the rail network in Waterford, Ireland. The project includes installation of more than 600 Stonereefs modules, making it the company's largest marine biodiversity project to date. The reef structures are established as part of the required environmental mitigation measures around the construction works and will help restore habitats for local marine species and increase biodiversity in the area.
System: REEFrame2026 · Copenhagen, Denmark
Papirøen developer (DGNB certification)
A series of purpose-designed reef modules from Stonereefs have been installed around the load-bearing pillars at Paper Island in Copenhagen, located next to the Opera House. The project is developed as an integrated part of the building's sustainability strategy, where the developer is actively working to strengthen underwater biodiversity as part of a higher DGNB certification. The reef modules create new hard surfaces and hiding places for marine organisms while bringing ecological considerations into the future of urban development.
System: REEFlex2026 · Aarhus, Denmark
Danish Technological Institute (partner), Femern Fyrtårn
As part of the innovation project "Femern Fyrtårn," Stonereefs, in collaboration with the Danish Technological Institute, has developed a new low-emission material for its reef modules. The material is based on moler clay and limestone and reduces the CO₂ footprint by up to 66 % compared with traditional materials. The first reef modules produced in the new material are installed in the Port of Aarhus, where they both function as marine habitats and demonstrate the potential for more climate-friendly solutions within maritime biodiversity infrastructure.
System: REEFlex2025 · Helsingør, Denmark
Helsingør Havn
Helsingør Havn has prioritized contributing to blue biodiversity in its marina. Visible reef modules hang between the piers, allowing both visitors and fish to benefit from them.
System: REEFlex2025 · Korsør, Denmark
Korsør Havn (client), DTU Sustain (Research), Sund & Bælt (Monitoring)
This project in Korsør Havn is a collaboration between the harbour, which is the initiator and owner of the reef modules, and DTU Sustain, which conducts ongoing monitoring. The project is also part of Sund & Bælt's effort to improve local biodiversity in the Great Belt.
System: REEFlex2025 · Copenhagen, Denmark
WWF (initiator and client), Københavns Kommune (owner of installation location)
In this project, Stonereefs, together with marine biologists from WWF, has designed a series of reef modules aimed at specific marine species in Øresund. The modules create very specific habitats intended to strengthen the conditions for targeted species in the ecosystem. The modules are installed at Sundkaj in Copenhagen.
System: REEFlex2025 · Studstrup (Aarhus), Denmark
Ørsted (client), WSP (Monitoring)
As part of Ørsted's biodiversity strategy, they aim to improve biodiversity around their infrastructure projects. In this context, 40 reef modules have been installed at Studstrupværket's harbour. The project's setup mirrors that of the International School installation, allowing for comparison of results.
System: REEFlex2025 · Sprogø, Denmark
Sund & Bælt (client), DTU Sustain (Research)
At Sprogø, the small island passed when crossing the Great Belt Bridge, four artificial reef modules have been installed in the small harbour. The project is part of Sund & Bælt's broader effort to improve local biodiversity in the Great Belt.
System: REEFlex2025 · Hellerup, Denmark
Tuborg Havn (client), DS Norden (sponsor), Stonereefs (Monitoring)
Tuborg Havn in Hellerup, operated by Den Kongelige Danske Yachtklub, has chosen to invest in improved biodiversity. 25 reef modules, three times the size of our standard modules, have been installed to create habitats for both large and small marine animals in the harbour.
System: REEForm2025 · Copenhagen, Denmark
Naturcenter Amager Strand (client)
The project completed as part of a teaching program where 100 third grade classes from Amager Fælled School designed artificial reefs to support local biodiversity at Amager Strand.
System: REEFlex2024 · Copenhagen, Denmark
BY & HAVN (client), WSP (Monitoring)
In collaboration with BY & HAVN, Stonereefs has installed 22 modules at the Cruise Terminal in Copenhagen Harbour. Like several of our other installations, this project is monitored by WSP to track biodiversity development.
System: REEFlex2024 · Fredericia, Denmark
Naturpark Lillebælt (client), Fredericia Kommune (client), Anemo Robotics (Monitoring)
In collaboration between Naturpark Lillebælt and Fredericia Kommune, a total of 22 reef modules have been installed in Kanalbyen in Fredericia. Eight of the modules were designed by local schoolchildren and depict sea animals such as dolphins, fish, crabs, and octopuses. The project is monitored by Anemo Robotics through video.
