Oriximiná is the westernmost and second-largest (by territorial area) municipality in the Brazilian state of Pará. It is also the fourth-largest in the country.

Geography

The city lies on the Trombetas river, 40 km northwest of Óbidos. The city is crossed by the Equator. Oriximiná is served by Oriximiná Airport located 8 km from downtown Oriximiná. Porto Trombetas Airport located in the district of Porto Trombetas 70 km away serves the population residing and working for the Mineração Rio do Norte S/A. The north of the municipality contains the larger part (75.89%) of the 4245819 ha Grão-Pará Ecological Station, the largest fully protected tropical forest conservation unit on the planet. The municipality also contains the 1007580 ha Rio Trombetas Biological Reserve, a strictly protected conservation unit created in 1979 to preserve the ecology and specifically to protect the Arrau turtle. The municipality contains part of the Saracá-Taquera National Forest, a 441283 ha sustainable-use conservation unit created in 1989. It contains 88% of the 3172978 ha Trombetas State Forest, created in 2006.