In this section:

What is an ecologically or biologically significant area (EBSA)?

An EBSA is an area of the ocean that has special importance in terms of its ecological and biological characteristics: for example, by providing essential habitats, food sources or breeding grounds for particular species. In 2008, a process to recognise these special areas was put in place by the United Nations Convention on Biological Diversity (CBD). Based on a set of seven scientific criteria, this process provides a framework to methodically and objectively describe those areas of the ocean that are crucial to the healthy functioning of the global marine ecosystem. EBSAs are areas of the ocean that are judged – through a technical process – to meet one or more of the following seven scientific criteria:


EBSAs cover many different types of marine ecosystems in different regions: they encompass areas that have been shown to hold the greatest richness of species and productivity, possess rare or endemic species, or are home to unique communities of fauna and flora.

To date, there are more than 270 EBSAs described around the world. They occur in all regions of the planet from the poles to the equator, and in all water depths from the coast to the deep ocean. They can be found in national waters, span territorial boundaries, lie partially or wholly within areas beyond national jurisdiction, and can even overlap each other. There is no minimum or maximum size for an EBSA: they can be small or cover vast expanses of the ocean.

The flexibility of the EBSA approach reflects the dynamic and complex nature of the marine environment. For example, an EBSA can be based around a single static feature, such as a seamount, or a collection of similar features, such as a chain of seamounts, where interconnectivity between the individual seamounts is critical for the overall health and survival of the local ecosystem. EBSAs may also contain a variety of seafloor features over a range of water depths that collectively provide important habitat for marine ecosystems.

EBSAs can also move position over time, and their boundaries can dynamically change in line with seasonal, annual or longer-term shifts in oceanographic or climatic features, such as seasonal changes in ocean circulation or patterns of sea ice. This allows the EBSA description to more accurately reflect the natural variability of its ecological or biological characteristics.

The EBSA designation does not bring any management measures or restriction of activities – it is simply recognition of an area’s biological or ecological significance. However, the information used to describe EBSAs can also be highly valuable for conservation and management, for example in supporting the case for area-based management tools, such as marine protected areas or environmental impact assessments.

How does the EBSA process work?

Over the past 6 years, a series of regional workshops have been convened around the globe by the CBD to examine the information available to support the description of EBSAs. Scientific, regional and technical experts come together to source, discuss and assess the data available for a particular region of the ocean.

This is a technical exercise, but as well as scientific data, other sources of information are taken into account, such as traditional knowledge which encompasses the knowledge, innovations and practices of indigenous peoples and local communities. The results are a series of technical descriptions of areas of the ocean that considered important in the context of one or more of the seven scientific EBSA criteria. These descriptions are assessed by the CBD’s Subsidiary Body on Scientific, Technical and Technological Affairs (SBSTTA) and subsequently considered at the CBD’s Conference of the Parties.

As of December 2016, workshops have taken place in the following regions, collectively covering 74% of the world’s oceans:

  • Western South Pacific
  • Wider Caribbean & Western Mid-Atlantic
  • Southern Indian Ocean
  • Eastern Tropical & Temperate Pacific
  • North Pacific
  • South-Eastern Atlantic
  • Arctic
  • North-West Atlantic
  • Mediterranean
  • North-East Indian Ocean
  • North-West Indian Ocean and adjacent Gulf areas
  • Seas of East Asia
The geographic boundaries of the 12 regional EBSA workshops convened by the CBD up to the end of 2015. Image courtesy MGEL/Duke University



These workshops have generated more than 270 EBSAs around the world, with the potential for more candidate EBSAs to be described at forthcoming regional workshops. EBSA descriptions are kept in the CBD’s EBSA Repository, and are openly available online along with the official reports of the regional workshops.


What is GOBI’s role in the EBSA process?

GOBI has provided strategic input into each stage of the EBSA process. Representatives from GOBI partners have participated in all regional EBSA workshops, providing scientific expertise, guidance and consistency in the application of EBSA criteria across areas, workshops and regions. GOBI partners CSIRO and the Marine Geospatial Ecology Lab at Duke University provide specific expert technical support for data collation and visualisation.


Where next for EBSAs?

The EBSA process is far from a standstill. There is a renewed drive to update and strengthen the evidence base in support of existing EBSAs by recognising four emerging categories of EBSA, and inviting Parties to include the results of their national EBSA-like processes in the CBD Repository. as well as continuing to describe additional EBSAs during upcoming regional workshops. The second is to give future consideration to gaps in the representativity of EBSAs, especially in ABNJ. The aim is to provide relevant ecological or biological information to support States and competent international organisations who can take management measures including the design and establishment of a coherent, representative network of marine protected areas that will help implement an ecosystem-based approach.


How can EBSAs be used in conservation planning?

Some Parties to the CBD have already used EBSA descriptions to inform their national processes or to secure international funding to support further research. Competent authorities have also begun to incorporate information from the EBSA process into their management decisions. It is anticipated that EBSAs will play an important role in the discussions surrounding the development of a new international legally binding instrument under UNCLOS to support the conservation and sustainable use of marine biological diversity beyond areas of national jurisdiction.

The EBSA process provides a recognition of special marine areas based on the consistent application of internationally agreed scientific criteria. This information can be used to support area-based planning and decision making. Five examples of conservation management practices that have incorporated EBSAs and EBSA-like processes into decision-making are:

  • In the Atlantic work is underway to integrate EBSAs, Vulnerable Marine Ecosystems (VMEs) and High Seas MPAs with ‘Blue Growth’ scenarios. This will be taken forward by the EU ATLAS Project, with 12 case studies intended to demonstrate options for integration at an appropriate scale.
  • Portugal is proposing the establishment of large national EBSAs on its extended continental shelf. These proposals have to be consistent with national marine spatial planning objectives and the development of indicators to ensure conservation and delivery against targets and measures set out by the EU Marine Strategy Framework Directive.
  • In Mauritanian waters, EBSA data are being used to support the case at the International Maritime Organization to create a Particularly Sensitive Sea Area on the basis that biodiversity in that area is vulnerable to impacts from international shipping.
  • In South Africa, a national process ‘Operation Phakisa’ has used EBSA data to contribute to baseline information as part of a holistic planning exercise resulting in conservation measures.
    The North-western Mediterranean Pelagic Ecosystems EBSA illustrates how EBSA criteria can underpin advocacy for detailed management options (further research, fisheries gear specifications, seasonal closures, MPAs).