Baía de Guanabara is a large, historically significant coastal bay located in Rio de Janeiro, Brazil. Spanning approximately 400 square kilometers, it is a complex ecosystem influenced by tidal exchange, with a significant portion of its water volume flushing every 11.4 days. The bay receives freshwater input from numerous rivers, including the Rio Caceribu, and is characterized by a mix of open waters, rocky reefs, and estuarine environments. Despite facing considerable environmental pressures from urban and industrial pollution, the bay supports a resilient fishery that has been active for over a century. Angling here is primarily an inshore saltwater pursuit, targeting a variety of demersal and pelagic species from both boat and shore.