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Nigeria remains West Africa's largest producer by far, but if you want an exciting exploration prospect then Senegal and Mauritania are the places to be

Vast reserves are the oil sands' main advantage. Local producers think they can drive costs down where foreign entrants couldn't

Drilling in Alaska is pricey compared with tight oil in the Lower 48. But the potential remains huge

In consolidating his hold on power, Crown Prince Mohammed will have alienated dozens of senior princes