Açude Armando Ribeiro Gonçalves is the largest reservoir in Rio Grande do Norte, Brazil, situated in the heart of the Vale do Açu (Açu Valley) in the semi-arid Sertão Potiguar region. This massive impoundment serves as a landmark destination for anglers throughout the Northeast, drawing fishing enthusiasts from across the region who come to target its diverse and productive fishery. The reservoir lies approximately 200 km west of Natal, accessible via the BR-304 highway toward the city of Açu, which sits roughly 35 km from the water and serves as the primary hub for visiting anglers. The surrounding landscape is characteristic of the Caatinga biome — a rugged, semi-arid environment defined by thorny scrub vegetation, dramatic seasonal rainfall patterns, and intense heat, all of which shape the fishing experience throughout the year.