Horizon Oil Limited, together with its subsidiaries, engages in the exploration, development, and production of oil and gas properties in China, New Zealand, and Australia. It holds interest in the Block 22/12 oil fields in Beibu Gulf, China; the PMP 38160 Maari/Manaia oil fields in New Zealand; and the Mereenie OL4 and OL5 oil and gas fields in Amadeus Basin, Australia; as well as engages in the exploration and evaluation of hydrocarbons. Horizon Oil Limited was incorporated in 1969 and is headquartered in Sydney, Australia.