Rio Cautário State Extractive Reserve

Rio Cautário State Extractive Reserve
Reserva Extrativista Estadual Rio Cautário
IUCN category VI (protected area with sustainable use of natural resources)
Falls on the Cautário River
Nearest city	Costa Marques, Rondônia
Coordinates	12°02′54″S 64°17′30″W / 12.04839°S 64.291624°W / -12.04839; -64.291624Coordinates: 12°02′54″S 64°17′30″W / 12.04839°S 64.291624°W / -12.04839; -64.291624
Area	146,400 hectares (362,000 acres)
Designation	Extractive reserve
Created	8 August 1995
Administrator	Secretaria de Estado do Desenvolvimento Ambiental (Rondônia)

The Rio Cautário State Extractive Reserve (Portuguese: Reserva Extrativista Estadual Rio Cautário) is an extractive reserve in the state of Rondônia, Brazil.

The Rio Cautário State Extractive Reserve is divided between the municipalities of Guajará-Mirim (47.5%) and Costa Marques (52.5%) in the state of Rondônia. It has an area of 146,400 hectares (362,000 acres). The reserve lies to the northwest of the BR-429 highway from São Francisco do Guaporé to Costa Marques on the border with Bolivia. It adjoins the Rio Cautário Federal Extractive Reserve to the north of its eastern part, separated from the federal reserve by the Cautário River. The Cautário River runs through the west part of the reserve to join the Guaporé River on the border with Bolivia. In the southwest the reserve is bounded by the Guaporé River.

The Cautário River is a meandering river with clear water. The depth does not exceed 2 to 3 metres (6 ft 7 in to 9 ft 10 in) in the dry season, and about 5 to 6 metres (16 to 20 ft) in the short season of high water. The river rises in the Uru-Eu-Wau-Wau Indigenous Territory and receives tributaries from the Serra Uopianes and the Serra Pacaás Novos. It is fed by a region without major deforestation and silting of the river's margins. It has rapids, but always with a drop of less than 2 metres (6 ft 7 in). The most rugged stretch is between Redenção e Bom Destino. It is navigable, even in the middle section around Bom Destino, but only in the rainy season.

During the wet season extensive areas of the forest are flooded. The climate is hot and humid, with temperatures of 24 to 26 °C (75 to 79 °F) throughout the year. Annual rainfall varies from 1,400 to 2,500 millimetres (55 to 98 in). Altitudes range from 100 to 250 metres (330 to 820 ft). The reserve is covered by open submontane rainforest (63%), pioneer alluvial formations (15.5%), dense alluvial rainforest (8.6%) and savanna (6.5%). The forest is well-preserved near the waterways.