The Nottawasaga River is a river located in southern Ontario, Canada. It flows approximately 70 kilometers from its source near the town of Nottawa to its mouth at Georgian Bay. The river is known for its scenic beauty and diverse ecosystems, making it a popular destination for outdoor activities such as fishing, kayaking, and hiking. The river is part of the Nottawasaga Valley Conservation Authority, which works to protect and manage the natural resources in the area. The river's watershed includes several tributaries and wetlands, contributing to its ecological significance. It also plays a vital role in local water management and flood control efforts.