The Saint Lawrence Seaway Authority is a Canadian government agency responsible for the operation and maintenance of the Saint Lawrence Seaway. This waterway connects the Great Lakes to the Atlantic Ocean, facilitating international shipping and trade. The Seaway plays a crucial role in the economy by allowing large vessels to transport goods efficiently. Established in 1959, the Authority oversees the navigation and safety of the Seaway, ensuring that it remains open and accessible for maritime traffic. It collaborates with the Saint Lawrence Seaway Development Corporation, which manages the U.S. portion of the waterway, to promote seamless cross-border shipping.