The Foz do Amazonas - Marajo Basin is a predominantly offshore basin located in the western portion of the Brazilian Equatorial Margin, adjacent to the French Guiana Guyana Basin. Compared to the prolific southern Brazilian basins, the Foz do Amazonas - Marajo Basin has seen minimal activity to date, and so limited success, but holds the potential for significant discoveries. The fiscal regime provides little cushion to the high costs in this remote region, and as a result, creating value is challenging. This exploration basin report is one of six covering exploration in Brazil. It provides a detailed analysis of recent exploration and future expectations including discovery and development costs, maps and details of licensing and fiscal terms. We also evaluate the yet-to-find volume and value creation potential. The report is accompanied by multiple excel downloads.