ABSTRACT1. Regional approaches to protecting the marine environment have gathered momentum over the past 40 years. Pioneered by UNEP's Regional Seas Programme, such approaches have broadened their remit from pollution prevention to the conservation of biodiversity, promoting management tools such as networks of marine protected areas (MPAs).2. Formal intergovernmental approaches are increasingly complemented by a range of regional projects committed to ambitious targets to establish MPAs and Local Marine Managed Areas (LMMAs). These regional efforts have been inspired by political leaders, non-governmental organizations, coastal communities and committed individuals.3. Regional networks of MPA managers have drawn together professionals to share good practice and further develop management tools. They focus on partnerships and capacity building opportunities with support from international donors and implementing agencies.4. Collective ecosystem-based management delivered using a regional approach is identified as a preferred solution to environmental challenges in polar regions. Crossing boundaries and fostering regional synergies can help ensure ecologically coherent regional networks and support resilience. There is also the potential to reap tangible rewards from applying such a regional approach in many other areas.5. Regional coherence of MPA network design, compliance and enforcement policies, and information sharing is an optimal way to understand and counter commercial and industrial resource extraction forces actively working against sustainable development.