Marathon Oil Corporation operates as an energy company worldwide. The company's Exploration and Production segment explores for, produces, and markets liquid hydrocarbons and natural gas in the United States, Angola, Canada, Equatorial Guinea, Ethiopia, Gabon, Kurdistan Region of Iraq, Libya, Norway, Poland, and the United Kingdom. Its Oil Sands Mining segment mines, extracts, and transports bitumen from oil sands deposits in Alberta, Canada; and upgrades the bitumen to produce and market synthetic crude oil and vacuum gas oil. As of December 31, 2012, this segment had rights to participate in developed and undeveloped leases totaling approximately 43,000 net acres. The company was formerly known as USX Corporation and changed its name to Marathon Oil Corporation in July 2001. Marathon Oil Corporation was founded in 1887 and is headquartered in Houston, Texas.