Region
United States
587
Great Britain
36
China
22
Europe
21
Outer space
20
Developing countries
19
India
18
Australia
15
Japan
15
California
13
New York (State)
12
France
11
Canada
10
Africa
9
England
9
Asia
7
Germany
7
Italy
7
Middle East
7
Netherlands
7
North America
7
Washington (State)
7
New Mexico
6
Texas
6
Hanford Site
5
Michigan
5
New York
5
Russia (Federation)
5
European Union countries
4
Florida
4
Latin America
4
Massachusetts
4
Mexico, Gulf of
4
Alaska
3
Arctic regions
3
Arizona
3
Austin
3
Carlsbad Region
3
Colorado
3
Glen Canyon Dam (Ariz.)
3
Middle West
3
Mississippi River
3
Montana
3
Nevada
3
Russia
3
Scandinavia
3
South Carolina
3
Spain
3
Utah
3
Yucca Mountain
3
more ...