mackinac

noun

1. Straits of, a strait between the peninsulas of Upper Michigan and Lower Michigan, connecting lakes Huron and Michigan.
2. Also Mackinac Island. an island in Lake Huron at the entrance of this strait. 517; 3 miles (5 km) long.

noun

1. a wooded island in N Michigan, in the Straits of Mackinac (a channel between the lower and upper peninsulas of Michigan): an ancient Indian burial ground; state park. Length: 5 km (3 miles)