Saint-Louis Coast

The coast around Saint-Louis marks the meeting point of the Senegal River mouth and the Atlantic, creating a dynamic estuary environment where tidal exchange mixes with strong riverine outflow during the wet season. Spring tidal range runs 1.2 to 1.8 m — moderate by West African standards — following a semidiurnal pattern. The Canary Current keeps water temperatures lower than the latitude suggests, pulling cold upwelling along the nearshore shelf and concentrating fish stocks that have supported artisanal fleets for centuries. Saint-Louis itself, a UNESCO World Heritage city set on a long barrier island between the river and the ocean, is one of the most photographically striking coastal settlements in Africa. The surf breaks along the outer beach are powerful during northwest groundswell events in the boreal winter; the inner lagoon channels and river mangroves suit kayaking and birding year-round. Tidal state affects passage through the river mouth bar — outgoing ebb against incoming swell creates breaking conditions that local pirogue pilots read carefully. Open-Meteo Marine gridded model, accuracy class ±45 min / ±0.2–0.3 m.