The Great Lakes Seaway Trail, formerly named and commonly known as the Seaway Trail, is a 518-mile (834 km) National Scenic Byway in the northeastern United States, mostly contained in New York but with a small segment in Pennsylvania. The trail consists of a series of designated roads and highways that travel along the Saint Lawrence Seaway—specifically, Lake Erie, the Niagara River, Lake Ontario, and the Saint Lawrence River. It begins at the Ohio state line in rural Erie County, Pennsylvania, and travels through several cities and villages (including the cities of Buffalo, Niagara Falls, Rochester, Oswego, and Ogdensburg) before ending at the Seaway International Bridge northeast of the village of Massena in St. Lawrence County, New York. It is maintained by the non-profit Seaway Trail,