Region
Abraham Lincoln Birthplace National Historical Park
1
Abraham Lincoln Birthplace National Historical Park (Ky.)
1
Aegean Islands (Greece and Turkey)
8
Africa
4
Africa, Central
1
Africa, Southern
2
Alabama
1
Alaska
4
Alberta
1
Algeria
3
Alicante (Province)
1
Amazon River Region
2
Amazon River Watershed
1
America
2
Anne Arundel County
2
Antarctica
2
Arabian Peninsula
3
Arctic regions
1
Argentina
1
Arizona
10
Asia
1
Australia
15
Australia, Southeastern
1
Bahia (State)
2
Baja California (Mexico : Peninsula)
1
Baja California (Peninsula)
1
Balearic Islands
1
Balkan Peninsula
1
Barro Colorado Island
1
Benton County
1
Big Cypress National Preserve
1
Blue Ridge Mountains Region
1
Bluestone National Scenic River (W. Va.)
1
Boise Ridge
2
Bold Park (W.A.)
1
Boundary Waters Canoe Area
1
Boundary Waters Canoe Area (Minn.)
1
Brazil
4
Brazil, Northeast
1
British Columbia
1
British Isles
3
California
21
California, Southern
1
Canada
3
Canada (Est)
1
Canada, Eastern
5
Caribbean Area
2
Casa Grande Ruins National Monument
1
Casa Grande Ruins National Monument (Ariz.)
1
Cataract Canyon (Wayne County-San Juan County)
1
more ...