In the United States, the company operates approximately 11,000 oil and natural gas wells in hundreds of fields occupying across the Permian Basin, located in West Texas and southeastern New Mexico. In 2010, Chevron was the fourth largest producer in the region. In February 2011, Chevron celebrated the production of its 5 billionth barrel of Permian Basin oil. The Gulf of Mexico is where the company's deepest offshore drilling takes place at Tahiti and Blind Faith. It also explores and drills the Marcellus Shale formation under several northeastern US states.