Ultra Petroleum Corp. (Ultra) is an independent oil and gas company engaged in the development, production, operation, exploration and acquisition of oil and natural gas properties. The Company's operations are primarily located in the Green River Basin of southwest Wyoming and the north-central Pennsylvania area of the Appalachian Basin. Ultra's operations in southwest Wyoming are focused on developing its natural gas reserves in a tight gas sand trend located in the Green River Basin with targets in the sands of the upper Cretaceous Lance Pool in the Pinedale and Jonah fields. As of December 31, 2012, Ultra owned interests in approximately 84,000 gross (49,000 net) acres in Wyoming covering approximately 190 square miles. In December 2012, CorEnergy Infrastructure Trust, Inc acquired a liquids gathering system (LGS) from Ultra.