Canadian Natural Resources Ltd. is a senior 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 and Upgrading; Midstream and Refining; Exploration and Production; and Head Office. The Oil Sands Mining and Upgrading segment produces synthetic crude oil through bitumen mining and upgrading operations. The Midstream and Refining segment focuses in maintaining pipeline operations and investment. The Exploration and 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.