Ultra Petroleum Corp. (Ultra) is an independent oil and gas company. The Company is engaged in the development, production, operation, exploration and acquisition of oil and natural gas properties. The Company focuses on developing its natural gas reserves in the Green River Basin of Wyoming - the Pinedale and Jonah fields - and is in the early exploration and development-stages in the Appalachian Basin of Pennsylvania. As of December 31, 2011, the Company was conducting operations in the United States. As of December 31, 2011, Ultra owned interests in approximately 93,000 gross (53,000 net) acres in Wyoming covering approximately 190 square miles. During the year ended December 31, 2011, the Company acquired 149,000 gross (130,000 net) acres in eastern Colorado�s Denver Julesburg Basin. In December 2012, CorEnergy Infrastructure Trust, Inc acquired a liquids gathering system (LGS) from Ultra.