The Thunder Bay National Marine Sanctuary is located in Lake Huron, off the coast of Michigan. Established in 2000, it protects a significant collection of shipwrecks and underwater cultural heritage. The sanctuary covers approximately 4,300 square miles and is home to over 200 known shipwrecks, many dating back to the 19th century. Visitors to the sanctuary can enjoy various activities, including snorkeling, diving, and boating. The sanctuary also offers educational programs and resources to promote awareness of maritime history and conservation. It plays a vital role in preserving the region's rich nautical heritage and supporting local tourism.