| Saco River | |
| Pushpin Map: | Brazil |
| River System: | Paracauari River |
| Mouth Coordinates: | -0.6438°N -48.5815°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Saco River (Portuguese: Rio Saco) is a river in the state of Pará, Brazil. It is a left tributary of the Paracauari River.
The Saco river is on Marajó island in Pará state, and is contained within the Marajó Archipelago Environmental Protection Area.It is a left tributary of the Paracauari River, which enters the Atlantic at Soure, Pará.The mangroves of the left (east) bank of the Saco are protected by the Soure Marine Extractive Reserve.This covers of typical mangroves forest and tidal waters.The riverine Manguezal do Rio do Saco section has an area of about .The climate is equatorial Amazon.