Baía de São José is a significant tidal bay located on the northern coast of Maranhão, Brazil, just to the east of the state capital, São Luís. This expansive body of water is characterized by its extensive intertidal zones, covering approximately 90 square kilometers of habitat that is heavily influenced by the daily ebb and flow of the tides. The bay's ecosystem is complex, blending estuarine conditions with marine influences, creating a rich environment that supports a diverse array of fish species. Its proximity to the unique Lençóis Maranhenses National Park adds to the region's ecological importance. For anglers, the bay presents a dynamic saltwater fishing environment where success is closely tied to understanding tidal movements, seasonal patterns, and the structure of the estuary.