Mambaí is a city in eastern Goiás state, Brazil. It is the easternmost city in that state. The settlement began in the 19th century when settlers fro…Mambaí is a city in eastern Goiás state, Brazil. It is the easternmost city in that state. The settlement began in the 19th century when settlers from the state of Bahia came looking for rubber produced by the mangabeira tree. The village that appeared took the name Riachão. After the building of a chapel and the passing of muleteers heading to Bahia the settlement began to grow. Soon the name was changed to Mambaí and it became a district of the municipality of Posse. The origin of the name is unknown. In 1958 it was dismembered from Posse and became an autonomous municipality.