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Which Indigenous language groups were spoken north and south of the Amazon River?

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Map of South America and the Caribbean showing the distribution of Aboriginal cultural groups, with regions color-coded by cultural type including Andean, Central American, tropical forest, and various nomadic cultures such as aquatic nomads, forest hunters and gatherers, and shellfish gatherers. Major group names are labeled across the continent and surrounding islands. — South American forest Indian Distribution of aboriginal South American and circum-Caribbean cultural groups.

The linguistic landscape of the Amazon basin is highly complex, with numerous groups distributed across the region. While many tribes have historically migrated, leading to overlapping territories, general geographic associations for major language families can be identified relative to the Amazon River.12

North of the Amazon River

Indigenous groups located north of the Amazon basin include:
* Arawak: Found in regions such as Guyana.1
* Carib: Primarily located in the Guianas and adjacent areas of Venezuela and Brazil.2
* Other groups: Including the Goajiro and Sinu (Cenú) of northern Colombia, and the Emberá near the Colombia-Panama border.1

South of the Amazon River

The area south of the Amazon is characterized by a high concentration of Tupian speakers, who historically spread from the Amazon valley down to the Río de la Plata. Other groups south of the basin include:234
* Guaraní: Located in southeastern Bolivia and northwestern Argentina.1
* Toba: Found in northern Argentina.1
* Ge: Primarily situated in the semi-arid lands of central Brazil.2

While these classifications provide a general overview, many smaller, localized groups exist throughout the region, and linguistic distribution remains fluid due to historical migration and cultural change.12