Cannabaceae October 12, 2016October 12, 2016 thcscience_admin River in BrazilPiauí RiverLocationCountryBrazilPhysical characteristicsSource • locationPiauí state The Piauí River is a river of Piauí state in northeastern Brazil. See also[edit] List of rivers of Piauí References[edit] Brazilian Ministry of Transport[dead link]