Region
United States
51
Alaska
37
California
22
Colorado
10
Nevada
9
Texas
9
Florida
6
Hawaii
6
North America
6
San Francisco Bay Area
6
Washington (State)
6
West (U.S.)
6
Montana
5
Afghanistan
4
Atlantic Coast (U.S.)
4
Kilauea Volcano (Hawaii)
4
New Mexico
4
Taylor Mountains
4
Idaho
3
Kansas
3
Kilauea Volcano
3
Massachusetts
3
Oregon
3
Utah
3
Antarctica
2
Atlantic Ocean
2
Cascade Range
2
Front Range (Colo. and Wyo.)
2
Little Blackwater River Watershed
2
Long Island Sound (N.Y. and Conn.)
2
Louisiana
2
Mars (Planet)
2
Maryland
2
Massachusetts Bay (Mass.)
2
Missouri
2
Nebraska
2
New Jersey
2
Oklahoma
2
Pacific Ocean
2
South Carolina
2
Tennessee
2
Virginia
2
Wyoming
2
Yukon River Valley (Yukon and Alaska)
2
Afognak Region
1
Alaska Peninsula
1
Alaska, Gulf of
1
Alaska, Southeast
1
Albuquerque Region
1
Aleutian Islands
1
more ...