Guaraní are a group of culturally related indigenous peoples of South America. They are distinguished from the related Tupí by their use of the Guaraní language. The traditional range of the Guaraní people is in present-day Paraguay between the Uruguay River and lower Paraguay River, the Misiones Province of Argentina, southern Brazil once as far north as Rio de Janeiro, and parts of Uruguay and Bolivia.[1] Although their demographic dominance of the region has been reduced by European colonisation and the commensurate rise of mestizos, there are contemporary Guaraní populations in these areas.