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 the Nembe king William Koko led a dawn attack of more than a thousand warriors on the company's headquarters at Akassa, which triggered a retaliatory raid that destroyed the kingdom's inland capital of Nembe. The British already had a consulate in Twon-Brass, from which after the fall of Koko they administered the area. Brass River The Brass River is one of the branches of the Nun River, which in turn is a branch of the Niger River, in the Niger Delta in Nigeria. In the 19th century the river was an important trading route, first for slaves and later for