What is the correlation between the location of Brazil's scattered indigenous-language communities and Brazil's physical geography?

The indigenous communities of native speakers of indigenous languages, such as Tupi, are concentrated the vast majority in the Amazon basin and in the most extreme locations in the country.

This correlation is due to the fact that indigenous people choose to live in territories that are far from urban centers to maintain their identity and tradition, that is, to preserve the way of life and culture of their ancestors. The Indians carry out primary activities, such as agriculture, hunting, fishing and plant extraction.