SVG version of a 2010 map to the location of the "Jubilee field" for petroleum (earth oil/gas) (red marked) before the western coast of Ghana near the border to Côte d'Ivoire. The area is part of the "National Interests Zone" of the USA.
Original file (png) at the Facebook profile of the US Embassy in Ghana
OECD Research and Development Statistics (RDS), 2010 Annual Data Report (?)