Thunder Bay National Marine Sanctuary
Height: 18 in
Width: 24 in
Map depicting the Thunder Bay National Marine Sanctuary boundary lines. The top right corner displays more information about the marin sanctuary. The map key is in the bottom left corner.
Thunder Bay National Sanctuary is a 4,300-square-mile expanse of on of America's best-preserved and nationally significant collection of shipwrecks. There have been ninety shipwrecks located with as many as one hundred more to be discovered. The shipwrecks allow a snapshot into centuries of Great Lakes shipping that still remains critical to the National economy today.