The Wilmington Oil Field is a prolific petroleum field in Los Angeles County in southern California in the United States. Discovered in 1932, it is the third largest oil field in the United States in terms of cumulative oil production. The field runs roughly southeast to northwest through the Los Angeles Basin, stretching from the middle of San Pedro Bay through Long Beach and east of the Palos Verdes Peninsula. The field originally contained approximately 3 billion barrels (480,000,000 m³) of reserves. As of 2002, approximately 90% of its original reserves had been recovered, leaving approximately 300 million barrels (48,000,000 m³).