The Igarapé Água Boa is a river system located on Ilha do Marajó within the state of Pará, Brazil. The river is part of a broader fishing and ecotourism destination, with a dedicated lodge operating in the area. The primary activity is sport fishing, conducted from 18-foot Jon boats powered by 40-horsepower outboard motors, indicating the river is navigable by small motorized craft. The river system extends for approximately 77 miles, encompassing the main river channel, lagoons, and tributaries. This suggests a network of waterways suitable for exploration, though the specific character of the water—whether fast-moving or slow, wide or narrow—is not detailed. The surrounding environment is part of the Amazon biome, implying lush rainforest and associated wildlife, though specific species are not listed. The presence of a professional guiding service indicates that the area is managed for tourism, but no specific public access points, portage locations, or regulations pertaining specifically to non-motorized paddling like kayaking or canoeing are mentioned. Similarly, there is no information on seasonal water levels, water temperature, water quality, or hazards relevant to paddlers. Notable nearby landmarks include Praia do Pesqueiro and Praia Grande de Salvaterra Beach on the island, but their relation to the river's course is not defined.