What is a large lake but is not one of the great lakes but is southwest of Hudson Bay?

A large lake southwest of Hudson Bay is Lake Winnipeg. It is located in Manitoba, Canada, and is one of the largest lakes in the country, covering an area of approximately 9,465 square kilometers (3,700 square miles). Lake Winnipeg is known for its ecological diversity and is a significant body of water in the region, providing recreational opportunities and supporting local fisheries.