The portion of M-28 between Seney and Shingleton, called the Seney Stretch, is of "straight-as-an-arrow highway" across the Great Manistique Swamp, "though others claim it's , only because it seems longer." The Seney Stretch is the longest such section of highway in the state, and "one of the longest stretches of curveless highway east of the Mississippi." The highway is often cited as the "state's most boring route" according to the Michigan Economic Development Corporation (MEDC) and "Hunts' Guide". The straightness and flatness over a great distance are given as reasons for the reputation of this stretch as boring.