Jari River

Jari River (Rio Jari)
Jary River
Jari River near Monte Dourado
Country	Brazil
States	Amapá, Pará
Mouth	Amazon River
Length	790 km (491 mi)
Basin	60,000 km2 (23,166 sq mi)
Discharge
- average	1,005 m3/s (35,491 cu ft/s)
Amazon Basin with Jari River in the northeast

The Jari River, or Jary River (Portuguese: Rio Jari), is a northern tributary of the Amazon River on the border between the states of Pará and Amapá in northeastern Brazil. It is in the most downstream regions of the Amazon Basin and borders the Guiana Highlands and the Guianas to the northwest.

The river flows through the Uatuma-Trombetas moist forests ecoregion. The source of the Jari is in the south of the Tumuk Humak Mountains, and its mouth is at the Amazon River between the municipalities of Almeirim in Pará and Vitória do Jari in Amapá. Ilha Grande de Gurupá, the second-largest island of the Amazon River Delta, is opposite of the mouth of the Jari River. Part of the river's basin is in the Maicuru Biological Reserve.

The Jari River forms the western boundary of the Tumucumaque Mountains National Park. Below the park it forms the western boundary of the 806,184 hectares (1,992,120 acres) Rio Iratapuru Sustainable Development Reserve, created in 1997. For part of its course it runs through the Jari Ecological Station. Small numbers of people have settled along the river here, built houses and cleared fields.