Question: The Straits of Mackinac Shipwreck Preserve are divided in two by a bridge spanning how long?
Sentence (from "Straits of Mackinac Shipwreck Preserve"): The waters of the preserve include the waters offshore from Mackinaw City and St. Ignace, as well as all or part of the shorelines of Bois Blanc Island, Mackinac Island, Round Island, and St. Helena Island.
Relevant evidence: No