The athletes on these boats are jockeying for position at the start of the Chicago Yacht Club Race to Mackinac Island (pronounced ‘Mack-i-naw’). The ‘Mac,’ at 333 miles long, is the world’s oldest and longest annual freshwater boat race. It’s an amateur event, but make no mistake, these sailors know their stuff. Many go on to race in the America’s Cup. This year’s race is held this weekend. The boats set sail—smallest to largest—just off Chicago’s Navy Pier, passing by the city skyline as we see in our image. When crews pass under the span of the mighty Mackinac Bridge—connecting the Lower Peninsula to the Upper Peninsula—Lake Michigan becomes Lake Huron, and the island appears.