Economy of Nigeria imports a significant amount of food to sustain itself. However, efforts are being made towards making the country food sufficient again. Nigeria's proven oil reserves are estimated to be ; natural gas reserves are well over . Nigeria is a member of the Organization of Petroleum Exporting Countries (OPEC). The types of crude oil exported by Nigeria are Bonny light oil, Forcados crude oil, Qua Ibo crude oil and Brass River crude oil. Poor corporate relations with indigenous communities, vandalism of oil infrastructure, severe ecological damage, and personal security problems throughout the Niger Delta oil-producing region continue to plague Nigeria's
Brass River at Yenagoa and flows south to discharge into the Gulf of Guinea. The tidal flats of the river have a reticulate drainage pattern, with higher elevation at the edges of the flats than at the center. Discharge varies depending on the season and state of the tide: An 1893 navigation guide says of the river, The mouth of the river is protected by a sand bar, which in 1893 could not be crossed by vessels with more than draft. Akassa creek, inland from the mouth of the river, provided a route from the Brass river to the Nun river for