The Saint Marys River is a natural waterway located in northeastern Florida, serving as a boundary between Florida and Georgia. It flows approximately 120 miles, starting from the confluence of the Suwannee River and the St. Marys River in the Okefenokee Swamp and eventually emptying into the Atlantic Ocean. The river is known for its scenic beauty and diverse ecosystems, making it a popular spot for recreational activities like fishing, kayaking, and wildlife observation. The river is also significant for its historical importance, as it was a vital transportation route for Native American tribes and later for European settlers. Today, the Saint Marys River is part of the Cumberland Island National Seashore, which helps protect its natural habitats and offers visitors opportunities to explore the area's rich history and biodiversity.