Petro Rio SA, formerly HRT Participacoes em Petroleo SA, is a Brazil-based holding company engaged in the oil and gas industry. The Company's activities are divided into three segments: Exploration and production (E&P), Geology and geophysics, as well as Management and others. The E&P segment focuses on exploration, development, production, import, export and sale of oil and natural gas byproducts. The Geology and geophysics division is responsible for the provision of geophysical and geological research services. The Management and others area mainly include corporate operations. The Company's exploration fields are primarily located in Brazil and Namibia. Furthermore, It controls a number of entities, such as HRT O&G Exploracao e Producao de Petroleo Ltda, HRT Africa Petroleo SA and HRT America Inc.