The U.S. Geological Survey (USGS) assessed the potential for undiscovered conventional oil and gas resources in the West-Central Coastal Province, west-central Africa, as part of its World Petroleum Assessment 2000. The USGS estimated a mean of 29.7 billion barrels of undiscovered conventional oil, 88.0 trillion cubic feet of gas, and 4.2 billion barrels of natural gas liquids. Most of the hydrocarbon potential remains in the offshore waters of the province, in the Central Congo Turbidites Assessment Unit.