Horizon Oil Limited, together with its subsidiaries, engages in the exploration, development, and production of oil and gas properties. It holds interest in the Block 22/12 oil field in Beibu Gulf, China, as well as engages in the exploration and evaluation of hydrocarbons; Maari/Manaia fields in New Zealand; and Stanley condensate/gas development and seven onshore permits in Papua New Guinea. Horizon Oil Limited is based in Sydney, Australia.