Mackinac, << MAK uh `naw` >> Straits of, is an important link in the water route between Lake Michigan and the Atlantic Ocean. The straits connect Lake Michigan and Lake Huron. They are at the northern end of the Lower Peninsula of Michigan. Mackinac Island lies in the straits. The straits are about 40 miles (64 kilometers) long and about 5 miles (8 kilometers) wide at the narrowest point. The Mackinac Bridge across the straits is one of the world’s longest suspension bridges. Its main span is 3,800 feet (1,160 meters) long. The bridge links Mackinaw City in the Lower Peninsula with the city of St. Ignace in the Upper Peninsula.