Uarini is a municipality located in the Brazilian state of Amazonas.

According to estimates of the Brazilian Institute of Geography and Statistics (IBGE), its population was 13,690 inhabitants in 2020.

[2] The municipality contains 38% of the 187,982 hectares (464,510 acres) Baixo Juruá Extractive Reserve, created in 2001.

Until the end of the seventeenth century, disputes between the Spaniards and the Portuguese overlapped in the territory, only consolidating under the military occupation of Portugal in 1790.

From the middle of the 19th century onwards, dismemberment of its territory began, giving rise to the new municipalities of São Paulo de Olivença, Coari, Fonte Boa, São Felipe (now Eirunepé), Xibauá (now Carauari) Japurá and Maraã.