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10. Nigeria

Crude production: 2.51 million barrels per day
Share of world production: 2.95%
Daily crude exports to the US: 1.02 million barrels
Proven reserves: 37.2 billion barrels

Pictured: The FPSO Bonga (Floating, Production, Storage and Offloading) facility 120 kms off the coast of Nigeria, south of Lago.

Photo: Jaques Lhuillery | AFP | Getty Images