Southwestern Energy Company is an independent energy company engaged in natural gas and oil exploration, development and production. The Company operates through two segments: Exploration and Production (E&P) and Midstream Services. Its operations are focused on the development of unconventional natural gas reservoirs located in Pennsylvania, West Virginia and Arkansas. Its operations in northeast Pennsylvania are focused on the unconventional natural gas reservoir known as the Marcellus Shale. Its operations in West Virginia are also focused on the Utica and the Upper Devonian unconventional natural gas and oil reservoirs (Southwest Appalachia). Its operations in Arkansas are primarily focused on an unconventional natural gas reservoir known as the Fayetteville Shale. It has exploration and production activities in Colorado and Louisiana along with other areas. Through its affiliated midstream subsidiaries, it is engaged in natural gas gathering activities in Arkansas and Louisiana.