Thumb Area Bottomland Preserve
| Thumb Area Bottomland Preserve | |
|---|---|
| Location | Lake Huron, Huron County, Michigan USA |
| Nearest city | Port Austin, Michigan |
| Coordinates | 44°01′24″N 82°46′16″W / 44.0232°N 82.771°W |
| Area | 276 square miles (710 km2) |
| Governing body | Michigan Department of Natural Resources |
The Thumb Area Bottomland Preserve, also called the Thumb Area Underwater Preserve, is a preservation area in Lake Huron in the U.S. state of Michigan. It is 276 square miles (710 km2) in size and is located off Michigan's Thumb north of Detroit.