Lagoa do Jequiá is a coastal lagoon situated in the municipality of Jequiá da Praia, on the southern coast of the Brazilian state of Alagoas. Formed where the Jequiá River spreads across the coastal plain before emptying into the Atlantic Ocean, this lagoon is a dynamic estuarine environment where freshwater and marine influences converge. The lagoon sits at the heart of the Lagoa do Jequiá Marine Extractive Reserve (Reserva Extrativista Marinha da Lagoa do Jequiá), a federally protected area of 10,231 hectares (25,280 acres) established in 2002 and administered by the Chico Mendes Institute for Biodiversity Conservation (ICMBio). The reserve extends from the lagoon itself down the Jequiá River to its mouth and then covers a rectangular stretch of Atlantic Ocean extending northeast along the coast, encompassing portions of the municipalities of Jequiá da Praia, Coruripe, and São Miguel dos Campos. This rich coastal ecosystem supports a thriving artisanal fishing community and offers anglers access to a diverse array of tropical species in a setting framed by mangroves, estuaries, and the broader Alagoas coastline.