Bahía Engaño is a shallow, productive bay on the coast of northern Patagonia in Chubut Province, Argentina. It serves as the estuary where the Chubut River discharges into the Atlantic Ocean after its 800-kilometer journey from the Andes. The bay is characterized by its high biological productivity, particularly of shrimp and small forage fish, which supports a diverse marine ecosystem and a significant artisanal fishery. The area includes the fishing port of Puerto Rawson at the river's mouth, approximately five kilometers from the city of Rawson.