Sentry Petroleum Ltd., an exploration stage company, acquires, explores, and develops oil and gas properties. It holds 100% interests in 4 exploration permits, including ATP 862, 864, 865, and 866 covering an area of approximately 6.9 million net acres located in the Adavale Basin, Queensland. The company was formerly known as Summit Exploration Inc. and changed its name to Sentry Petroleum Ltd. in December 2007. Sentry Petroleum Ltd. was founded in 2006 and is based in Denver, Colorado.