Rio Biguaçu is a coastal river in Santa Catarina state, southeastern Brazil, located approximately 28 kilometers from Florianópolis — about a 35-minute drive. The river drains into the Atlantic Ocean via the Baía Norte, with its mouth situated at roughly 27°30′S, 48°40′W. What makes this fishery particularly distinctive is its extensive mangrove system and a short central channel that connects directly to the Baía Norte. The tidal influence is the single most defining factor of fishing productivity here — the tide essentially dictates when and where fish will be found throughout the system. Average water depth runs between 1 and 4 meters, with the central channel reaching a maximum depth of around 8 meters. The ideal water temperature range for fishing is 18–24°C.