Equatorial Guinea is a country located in Central Africa, with an area of 28,000 square kilometres (11,000 sq mi). Formerly the colony of Spanish Guinea, its post-independence name evokes its location near both the Equator and the Gulf of Guinea. The discovery of large oil reserves in 1996 and its subsequent exploitation have contributed to a dramatic increase in government revenue. As of 2004, Equatorial Guinea is the third-largest oil producer in Sub-Saharan Africa. Its oil production has risen to 360,000 barrels per day (57,000 m3/d), up from 220,000 only two years earlier.