Rio Muqui is a river located in the municipality of Nova Brasilândia d'Oeste, in the state of Rondônia, Brazil. Situated in the western Amazon basin region, this waterway flows through one of Brazil's most biodiverse tropical landscapes, where dense rainforest meets agricultural frontier. The river's coordinates place it in a region characterized by the warm, humid climate typical of Rondônia, where seasonal rainfall patterns strongly influence water levels and fishing conditions throughout the year. As part of the broader river network of western Rondônia, Rio Muqui connects to a system of tributaries that drain into larger regional waterways, contributing to the rich aquatic ecosystem of the Amazon basin.