League of 11 Oil-Producing States In Nigeria (UPDATED)
Bayelsa State. Oloibiri oilfield in present-day Bayelsa state is the first place in Nigeria where oil was discovered. As of 2015, Bayelsa was contributing between 30-40% to Nigeria's major oil exports. It also has Nigeria's largest gas reservoir of 18 trillion cubic feet. Bayelsa is one of the smallest states in Nigeria by land area. Ondo State