Chesapeake Energy Corporation engages in the acquisition, exploration, and development of properties for the production of oil, natural gas, and natural gas liquids (NGL) from underground reservoirs in the United States. The company holds interests in natural gas resource plays, including the Marcellus in Northern Appalachian Basin in Pennsylvania; Haynesville located in Northwestern Louisiana; Eagle Ford in South Texas; Brazos Valley in Southeast Texas; Powder River Basin in Wyoming; and Mid-Continent in Anadarko Basin of northwestern Oklahoma. As of December 31, 2018, it owned interests in approximately 13,200 oil and natural gas wells; and had estimated proved reserves of 1,448 one million barrels of oil equivalent. Chesapeake Energy Corporation was founded in 1989 and is headquartered in Oklahoma City, Oklahoma.