Lac Saint-Jean is a large freshwater lake located in the province of Quebec, Canada. It covers an area of approximately 1,000 square kilometers and is known for its unique shape, resembling a large oval. The lake is surrounded by several towns, including Roberval and Saint-Félicien, and is a popular destination for outdoor activities such as fishing, boating, and swimming. The lake is fed by several rivers, including the Péribonka River, and drains into the Saguenay River. It plays a significant role in the local ecosystem and economy, supporting both tourism and fishing industries. The region around Lac Saint-Jean is also known for its rich cultural heritage, including the famous Lac Saint-Jean Festival.