Marine spatial planning is underway now, or starting, in many Pacific Island countries, including Tonga. This planning aims, amongst other things, to achieve the Convention on Biological Diversity’s (CBD) Aichi Target 11 which states, in part, that at least 10 per cent of coastal and marine areas are conserved through ecologically representative and wellconnected systems of protected areas. However, means for countries who have signed on to the CBD to achieve an ecologically representative system of marine protected areas is missing. There are not perfect data which describe the distribution and abundance of every marine habitat and species in the Pacific. And certainly not at a scale that is useful for national planning in the ocean. Bioregionalisation, or the classification of the marine environment into spatial units that host similar biota, can serve to provide spatially explicit surrogates of biodiversity for marine conservation and management.
