The scenic Susquehanna River draws adventurers looking to kayak, canoe, swim, and fish. The Susquehanna River flows more than 444 miles from New York to Maryland, making it thelargest tributary of the Chesapeake Bay. Flowing at an average of 20 miles per hour, the Susquehanna River becomes its widest in Harrisburg, where it stretches up to a mile and offers many launch points.