The St. Marys River is a natural waterway located in the United States and Canada, serving as a boundary between the two countries. It flows from Lake Superior to Lake Huron, connecting these two major Great Lakes. The river is approximately 70 miles long and is known for its scenic beauty and diverse ecosystems. The St. Marys River is also significant for navigation and commerce, featuring the Soo Locks that allow ships to bypass the rapids. This river supports various recreational activities, including fishing, boating, and wildlife observation, making it an important resource for local communities.