Lansdowne Oil & Gas plc (Lansdowne) is a United kingdom-based independent oil and gas company. Lansdowne and its subsidiaries explore and develop oil and gas reserves in the Irish Celtic Sea. The Company is engaged in the exploration and appraisal of hydrocarbons. Lansdowne is focused on oil and gas exploration and appraisal opportunities in the north celtic sea basin (NCSB) offshore southern Ireland. Lansdowne holds rights, through its wholly owned subsidiaries, to five Standard Exploration Licenses and one Licensing Option in the oil and gas prone shallow waters of the NCSB. As of December 31, 2011, the Company had interests in Irish waters, including 110% interest in Midleton Exploration License, 99% interest in Rosscarbery Exploration License, 100% interest in Amergin Exploration License, 20% interest in Barryroe Exploration License and 10% interest in Helvick Exploration License.