Michigan Underwater Preserves
Michigan Underwater Preserves or Michigan Bottomland Preserves are protected areas of the Great Lakes on Michigan's coast. The thirteen designated areas, comprising a surface area of over 7,000 square miles (18,000 km2), are considered to be "Underwater museums" and serve to protect concentrations of shipwrecks, unique geologic features and other submerged sites through awareness and public interest.
Source: Wikipedia — Michigan Underwater Preserves (CC BY-SA 4.0)