The Downtown area is at the confluence of the Chenango and Susquehanna Rivers, in the middle of a long but relatively narrow valley. The north branch of the Susquehanna River passes south of downtown. This branch rises in eastern New York and receives a number of tributaries above Binghamton. In the center of the city, the Chenango River feeds into the Susquehanna from the north at Confluence Park. The Binghamton River Trail, a 1.5 mile trail along the Chenango, runs between Cheri Lindsey Park on the Northside and Confluence Park in Downtown. Eleven bridges span the rivers inside city limits. Broome County has 17.5 miles of levees, many of which are in Binghamton. Major floods have occurred in 1865, 1935, 1936, 2006, and 2011.