This excerpt taken from the PBR 20-F filed May 22, 2009.
Bolivia, we operate gas fields that supply gas to Brazil. We hold an 11% stake in Gas Transboliviano S.A. (GTB), owner of the Bolivian section of the Bolivia-to-Brazil (BTB) pipeline that transports natural gas we produce in Bolivia to the
Brazilian market. We also hold a 44.5% stake in Transierra S.A., which owns the Yacuiba-Rio Grande gas pipeline (Gasyrg) linking the San Alberto and San Antonio fields to the BTB pipeline.