Region
Mississippi River
11
Missouri
11
United States
10
Southern States
8
Dismal Swamp (N.C. and Va.)
4
Dismal Swamp
2
Kentucky
2
Martinique
2
Alabama
1
Canada
1
Caribbean Area
1
Georgia
1
Mammoth Cave
1
Mammoth Cave (Ky.)
1
Maryland
1
Mississippi
1
Ohio
1
Okefenokee Swamp (Ga. and Fla.)
1
Philadelphia (Pa.)
1
États-Unis
1