The Jari Ecological Station lies in the municipalities of Almeirim, Pará, and Mazagão, Amapá.

Small numbers of people have settled along the Jarí River, which flows through the unit, built houses and cleared fields.

[6] Illegal gold prospecting occurs in the areas around the unit and pose the greatest threat through water pollution and hunting of local fauna, particularly mammals.

[6] The Jari Ecological Station was created by federal decree 87.092 of 12 April 1982, with an area of 207,370 hectares (512,400 acres).

[8] The Ecological Station is a "strict nature reserve" under IUCN protected area category Ia.