Region
United States
398
West (U.S.)
31
Southwestern States
10
Texas
10
Southern States
9
Galveston Bay
7
Soviet Union
7
Arizona
6
Canada
6
Mexico
6
North America
6
Northeastern States
5
Rocky Mountains
5
Southwest, New
5
East (U.S.)
4
Middle East
4
New Mexico
4
Africa
3
Antarctica
3
Colorado
3
Europe
3
Japan
3
Middle Atlantic States
3
Middle West
3
Polar regions
3
Utah
3
Arctic regions
2
Atlantic Coast (U.S.)
2
California
2
Earth (Planet)
2
Former Soviet republics
2
Hawaii
2
Idaho
2
Israel
2
Korea
2
Korea (South)
2
Maryland
2
Mexican-American Border Region
2
Mexico, North
2
Moon
2
Outer space
2
Russia (Federation)
2
South Africa
2
Western Hemisphere
2
Alps, Italian
1
Appalachian Basin
1
Arapaho National Forest
1
Asia, Central
1
Asia, Eastern
1
Atlantic Ocean
1
more ...