The Hi-Merimã people live between the Juruá

Jurua

The Juruá River is a southern affluent river of the Amazon River west of the Purus River, sharing with this the bottom of the immense inland Amazon depression, and having all the characteristics of the Purus as regards curvature, sluggishness and general features of the low, half-flooded forest...

 and the Purus

Purus

The Purus is a tributary of the Amazon River in South America. Its drainage basin is , and the mean discharge is 8,400 m³/s.It enters the Amazon River west of the Madeira River, which it parallels as far south as the falls of the latter stream...

 rivers, in the state of Amazonas in Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

.

Their numbers are uncertain, but in 1943 it was estimated that the Hi-Merimã consisted of more than 1,000 individuals. They were known primarily through their conflicts with neighboring tribes. They are considered isolated and mostly uncontacted

Uncontacted peoples

Uncontacted people, also referred to as isolated people or lost tribes, are communities who live, or have lived, either by choice or by circumstance, without significant contact with globalized civilisation....

. They have avoided contact with outward societies, as well as with neighboring native tribes, with whom they are antagonistic.

The Himarimã language

Himarimã language

Himarimã is the presumed language of the uncontacted Hi-Merimã people, who are thought to number about 40....

is undocumented.