Cais River From Wikipedia the free encyclopedia River in BrazilCais RiverLocationCountryBrazilPhysical characteristicsSource • locationPiauí state The Cais 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] 5°21′39″S 41°51′40″W / 5.36083°S 41.86111°W / -5.36083; -41.86111 This article related to a river in Piauí, Brazil is a stub. You can help Wikipedia by expanding it.vte