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Covering around 1,000 km2 in Rivers State, southern Nigeria, Ogoniland has been the site of oil industry operations since the late 1950s. Ogoniland has a tragic history of pollution from oil spills and oil well fires, although no systematic scientific information has been available about the ensuing contamination.

With this independent study, conducted at the request of the Federal Government of Nigeria, the United Nations Environment Programme (UNEP) reveals the nature and extent of oil contamination in Ogoniland. The Environmental Assessment of Ogoniland covers contaminated land, groundwater, surface water, sediment, vegetation, air pollution, public health, industry practices and institutional issues.

This report represents the best available understanding of what has happened to the environment of Ogoniland – and the corresponding implications for affected populations – and provides clear operational guidance as to how that legacy can be addressed.