High Quality Content by WIKIPEDIA articles! M-22 is a state trunkline highway in the US state of Michigan. It is 116.651 miles (187.732 km) long and follows the Lake Michigan shoreline of the Leelanau Peninsula, making up a portion of the Lake Michigan Circle Tour. It also passes through the Sleeping Bear Dunes National Lakeshore. The highway is U-shaped as it rounds the peninsula running through tourist areas in Leland and Suttons Bay in addition to the national park.