Laguna de Araruama is the largest hypersaline lagoon in South America, situated in the state of Rio de Janeiro, Brazil, within the scenic Região dos Lagos (Lakes Region). Positioned at approximately 22°52' south latitude and 42°20' west longitude, this remarkable body of water is a defining feature of the municipality of Araruama and its surrounding communities. Its hypersaline character — meaning salinity levels exceed that of typical seawater — gives the lagoon a unique ecological identity that shapes the fish species present, their behavior, and the fishing techniques that prove most effective. The lagoon's calm, warm waters are sheltered from the open Atlantic, creating conditions that attract both local anglers and visiting fishermen drawn by the diversity of coastal and estuarine species that thrive here. The surrounding landscape is characterized by flat, low-lying terrain with beaches lining much of the lagoon's perimeter, and the area enjoys a warm tropical climate year-round, making fishing accessible in every season.