Canadian Natural Resources Ltd. is an oil and natural gas production company, which engages in the exploration, development, marketing, and production of crude oil and natural gas. It operates through the following segments: Oil Sands Mining & Upgrading; Midstream & Refining; and Exploration & Production. The Oil Sands Mining & Upgrading segment produces synthetic crude oil through bitumen mining and upgrading operations. The Midstream & Refining segment focuses in maintaining pipeline operations and investment. The Exploration & Production segment comprises operations in North America, largely in Western Canada; the United Kingdom portion of the North Sea; and Côte d'Ivoire and South Africa in Offshore Africa. The company was founded on November 7, 1973 and is headquartered in Calgary, Canada.