The Saint Croix National Scenic Riverway is a federally protected system of riverways located in eastern Minnesota and northwestern Wisconsin. It protects of river, including the St. Croix River (on the Wisconsin/Minnesota border), and the Namekagon River (in Wisconsin), as well as adjacent land along the rivers. The St. Croix National Scenic Riverway is one of the original eight National Wild and Scenic Rivers, largely as a result of legislation by Senator Walter Mondale (MN) and more so by Senator Gaylord Nelson (WI). The largest scenic riverway east of the Mississippi River, it lies within parts of eight counties in Wisconsin: Bayfield, Burnett, Douglas, Pierce, Polk, St. Croix, Sawyer, and Washburn; and three in Minnesota: Chisago, Pine, and Washington.