Region
United States
881
China
23
Northwest, Pacific
19
European Union countries
15
India
13
Asia
12
Europe
11
California
10
Latin America
10
Canada
9
Developing countries
9
Alaska
8
Mexico
8
North America
8
Columbia River
7
Great Britain
7
Russia
7
Russia (Federation)
7
Soviet Union
6
Columbia River Valley
5
Hawaii
4
Pacific Area
4
Singapore
4
Southeast Asia
4
West (U.S.)
4
Africa
3
Appalachian Region
3
Brazil
3
Colombia
3
Indonesia
3
Scandinavia
3
South Asia
3
Africa, Sub-Saharan
2
Arctic regions
2
Argentina
2
Asia, Central
2
Australia
2
Bengal, Bay of
2
Caribbean Area
2
Caspian Sea Region
2
Earth (Planet)
2
East Asia
2
Europe, Eastern
2
Mediterranean Region
2
Middle East
2
Navajo Nation, Arizona, New Mexico & Utah
2
Pakistan
2
Puerto Rico
2
Spain
2
Tanzania
2
more ...