Encore Acquisition Company (EAC) is engaged in the acquisition and development of oil and natural gas reserves from onshore fields in the United States. The Company's properties and oil and natural gas reserves are located in four core areas: the Cedar Creek Anticline (CCA) in the Williston Basin of Montana and North Dakota; the Permian Basin of West Texas and Southeastern New Mexico; the Rockies, which includes non-CCA assets in the Williston, Big Horn and Powder River Basins in Wyoming, Montana and North Dakota and the Paradox Basin of southeastern Utah, and the Mid-Continent area, which includes the Arkoma and Anadarko Basins of Oklahoma, the North Louisiana Salt Basin, the East Texas Basin and the Mississippi Salt Basin. In January 2009, the Company sold certain oil and natural gas producing properties and related assets in the Arkoma Basin and royalty interest properties in Oklahoma, as well as 10,300 unleased mineral acres to Encore Energy Partners LP (ENP).