Towards sustainability of marine governance: Challenges and enablers for stakeholder integration in transboundary marine spatial planning in the Baltic Sea

Abstract Integrating stakeholderknowledge, views and needs in marine or maritime spatial planning(MSP) processes is important from a governance and social sustainabilityperspective both for MSP practitioners and for the evolving field of MSP research. Transboundary MSP appears particularly challenging for participation, which is why it is important to identify opportunities and address obstacles for stakeholderintegration in this specific context. This article examines how stakeholderintegration is currently practiced in the Baltic Sea Region (BSR), an enclosed sea where policy coherence and addressing conflicting interests across borders are especially relevant. It synthesises a range of challenges and enablers for stakeholderparticipation and mobilisation that have emerged from two transboundary MSP research and development projects, BaltSpace and Baltic SCOPE. The article finds that with the exception of statutory authorities, stakeholder engagementin the BSR is mostly limited to self-motivated stakeholdersand consultation rather than more inclusive forms of participation. This can reduce the quality and legitimacy of MSP processes and risks to concentrate power in the hands of a small group of actors. For transboundary stakeholderintegration to become more interactive and effective, five types of challenges need attention, regarding a) timing, b) governance systems, c) capacity and processes, d) stakeholdercharacteristics and e) knowledge and language. These obstacles can be addressed by (1) a dedicated research and development agenda that critically reflects on integrative tools and processes, and (2) by encouraging transnational institutions in the BSR to devote more resources to transboundary stakeholderintegration and adopt flexible and adaptive strategies and tools that can facilitate stakeholderinvolvement throughout the MSP policy cycle.