Subject Region
Australia
22
Cuba
22
Great Britain
15
China
14
United States
14
Spain
11
Turkey
10
Colombia
9
Illinois
9
Aegean Islands (Greece and Turkey)
8
California
8
Colorado
7
Espana
7
Middle West
7
North America
7
Venezuela
7
Mediterranean Region
6
Pennsylvania
6
England
5
Minnesota
5
Texas
5
Caribbean Area
4
Chile
4
Europe
4
Great Lakes Region (North America)
4
India
4
Ireland
4
New England
4
Yellowstone National Park
4
Africa
3
Amazon River Region
3
America
3
Argentina
3
Arizona
3
Brazil
3
British Isles
3
Ecuador
3
France
3
Galapagos Islands
3
Japan
3
Madagascar
3
Mexico
3
New South Wales
3
Poland
3
Québec (Province)
3
Africa, Central
2
Africa, Southern
2
Antarctica
2
Appalachian Region, Southern
2
Arabian Peninsula
2
more ...