In July 2006, the United Nations Environment Programme (UNEP) received a formal request from the Government of Nigeria for “Supervision of Remediation of the Cleanup of Oil Contamination in Ogoniland”. In order to understand the context of the request and expectations from the Government, UNEP's Executive Director sent a mission to Nigeria. Following the initial scouting mission, a technical mission was sent to the River State to meet with the local government and stakeholders to explain to them the scope of the assessment and obtain their reaction. The team undertook an aerial reconnaissance over the entire area and ground-truthing visits to selected areas. The team also visited the SPDC office to collect various documents and maps related to Ogoniland oil fields. This project document is prepared based on the inputs received during the field visits.