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Region
- United States8
- Massachusetts7
- Assateague Island National Seashore (Md. and Va.)4
- Alaska3
- Great Britain3
- ArizonaGrand Canyon National Park2
- Chandeleur Islands (La.)2
- Fire Island National Seashore (N.Y.)2
- George Washington Birthplace National Monument (Va.)2
- Gulf Islands National Seashore (Fla. and Miss.)2
- LouisianaChandeleur Islands2
- LouisianaGulf Coast2
- MississippiVicksburg National Military Park2
- Pearl River Valley (Miss. and La.)2
- Sandy Hook Unit of Gateway National Recreation Area (N.J.)2
- Vicksburg National Military Park (Miss.)2
- VirginiaGeorge Washington Birthplace National Monument2
- AlabamaMobile-Tensaw Delta1
- AlabamaThreemile Creek (Mobile County)1
- Alligator Point (La.)1