The Saint Marys River is a significant waterway located in the Upper Peninsula of Michigan. It serves as a natural border between the United States and Canada, connecting Lake Superior to Lake Huron. The river is approximately 70 miles long and plays a crucial role in shipping and transportation, particularly for the Great Lakes shipping industry. The river is also known for its diverse ecosystem, supporting various fish species, including salmon and trout. It features several parks and recreational areas along its banks, making it a popular destination for fishing, boating, and hiking. The Sault Ste. Marie area, located at the river's northern end, is a key hub for tourism and commerce.