Purus

In South America, the Purus River is a tributary of the Amazon River. It has a drainage basin of 371,042 km2 and an annual discharge of 11,207 m3/s on average. The river shares its name with the Alto Purs National Park and the Purs Province, one of Peru's four Ucayali Region provinces.

In Peru, the Purus River rises. After being joined by the Santa Rosa River, it defines the border between Peru and Brazil in the heart of the state of Acre, then runs for a short distance along the boundaries of the 231,555-hectare Santa Rosa do Purus National Forest, a sustainable use conservation unit established in 2001. It then flows into Manoel Urbano to the north-east. Between the Madeira River, which lines the edge of the Brazilian sandstone plateau, and the Ucayali River, which hugs the base of the Andes, it runs through a continuous forest at the bottom of the enormous depression.

The Purs red howler (Alouatta puruensis) is a howler monkey species native to Brazil, Peru, and Bolivia's northwestern region. The catfish Peckoltia brevis can be found in the Purus river basin in the middle and upper Amazon.

The Purus várzea ecoregion is home to the majority of the river's center and lower parts. The river passes through the 233,864-hectare Abufari Biological Reserve, a severely protected region in the municipality of Tapauá, Amazonas.

Total Length: 1,839 miles (shared with Brazil)