Jaci Paraná River

The Jaci Paraná River (Rio Jaci Paraná) is a river of Rondônia state in western Brazil. It is a tributary of the Madeira River, which it joins at Jaci Paraná in the municipality of Porto Velho, Rondônia

Tributaries of the Jaci Paraná river basin rise in the 216,568 ha Guajará-Mirim State Park, created in 1990. The river forms the western boundary of the 197364 ha Jaci Paraná Extractive Reserve, created in 1996.