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
Light River (South Australia) Light. The river reaches its mouth and enters the Gulf St Vincent through a mangrove estuary. The river descends over its course. The Light River has an expansive catchment within mainly undulating hills, much cleared since European settlement for farming and grazing purposes. There are no geological features that would permit a significant dam or reservoir. The noteworthy tributaries, by descending elevation, are Tothill Creek, Julia Creek, Pine Creek, St Kitts Creek, and the Gilbert River. The latter is a major tributary, merging into the Light River just below Hamley Bridge. The indigenous name for the river is Yarralinka. The