São Simão River River in Rondônia, Brazil From Wikipedia, the free encyclopedia The São Simão River is a river of Rondônia state in western Brazil. CountryBrazillocationRondônia statecoordinates12°39′S 63°5′WQuick facts Location, Country ...São Simão RiverLocationCountryBrazilPhysical characteristicsSource • locationRondônia state Mouth • coordinates12°39′S 63°5′WClose See also List of rivers of Rondônia References Brazilian Ministry of Transport This article related to a river in Rondônia, Brazil is a stub. You can help Wikipedia by adding missing information.vte Related Articles