Lagoa Manguaba is an estuarine lagoon located in the state of Alagoas in northeastern Brazil, centered at approximately 9°41'S, 35°54'W. It forms part of the Mundaú-Manguaba Lagoon Estuary Complex (ESEC), which is recognized as one of the most ecologically significant estuarine systems in Brazil. The lagoon receives freshwater from the Paraíba do Meio River and connects to the Atlantic Ocean to the east, while a network of channels links it to Lagoa Mundaú to the north. This interconnected system of rivers, lakes, and channels converging toward the Atlantic gives the paddling environment a distinctly dynamic, estuarine character, with water conditions influenced by both riverine inflow and tidal exchange.

The lagoon is accessible from the Maceió metropolitan area, and boat tours operating out of the Pontal da Barra pier serve the broader Mundaú-Manguaba complex, indicating established water access infrastructure in that area. The estuary complex supports native fauna and flora typical of a coastal Brazilian estuarine ecosystem, and the surrounding landscapes are noted for their natural character. A stop at the Bica da Pedra natural pools is included on organized boat tours of the complex, suggesting this is a notable feature within the waterway network.

The lagoon ranks among the top fishing destinations in Alagoas, pointing to a productive aquatic environment. Organized tours of the lagoon system typically depart in the morning and return by early evening, suggesting full-day itineraries are standard for exploring the complex. The lagoon holds cultural and historical significance for local communities, serving as a source of livelihood for residents in the surrounding area.

Paddlers should be aware that this is an open estuarine system with connections to both river systems and the ocean, meaning water levels and currents can vary with tidal and seasonal conditions. The broader estuary complex is considered one of the most important ecosystems in Brazil, which may carry associated environmental regulations.