The Rio Gurupi is a river in north-central Brazil that forms the boundary between the states of Maranhão and Pará. It originates in the low hills of the region. For paddlers planning a trip, the river's character is defined by its role as a state boundary, flowing through a less-developed area. Specific access points for putting in or taking out are not detailed, nor are there clear descriptions of recommended routes, day trips, or the locations of any facilities or amenities directly on the riverbanks. The overall aesthetic and specific wildlife features are not described. There is no information regarding seasonal water temperature patterns, water quality, or any notable water quality issues. Major hazards, safety considerations, specific restrictions or regulations for paddling, or the best seasons or times of day for paddling on this river are not mentioned. The historical or cultural significance of the Rio Gurupi is not elaborated upon. Paddlers should be aware that this river is located in a remote region and plan accordingly for self-supported expeditions, as detailed logistical and safety information appears to be limited.