Michigan wine in the context of Old Mission Peninsula AVA

Grand Traverse Bay (/ˈtrævərs/ TRAV-ərss) is an arm of Lake Michigan, located along the west coast of the Lower Peninsula of Michigan. The bay is separated from the rest of Lake Michigan by the Leelanau Peninsula. The bay is some 32 miles (51 km) long, ranges from 7 to 10 miles (11 to 16 km) wide, and up to 620 feet (190 m) deep in spots. It is the second-largest bay of Lake Michigan, behind Green Bay.

Grand Traverse Bay is further divided into an East Arm and West Arm by the 18-mile-long (29 km) Old Mission Peninsula. At the head of both arms of the bay is Traverse City, the largest city in Northern Michigan. The area surrounding the bay is renowned for its fruit production, especially for cherries and viticulture.

The Leelanau Peninsula (/ˈliːlənɔː/ LEE-lə-naw) is a peninsula of the U.S. state of Michigan that extends about 30 miles (50 km) from the western side of the Lower Peninsula of Michigan into Lake Michigan, forming Grand Traverse Bay. It is often referred to as the "little finger" of the mitten-shaped lower peninsula. The peninsula is a tourist hotspot, especially due to the popularity of Sleeping Bear Dunes National Lakeshore, which adorns the southwestern coast of the peninsula. The peninsula is also largely agricultural, notably for cherries and wine.

Most of the peninsula is politically part of the eponymous Leelanau County, which also administers the nearby Manitou Islands and Fox Islands. The base of the peninsula, at its southern end, is divided between Benzie County and Grand Traverse County. Traverse City, the largest city in Northern Michigan, is located at the southeastern end of the peninsula, at the head of Grand Traverse Bay.