Region
United States
24
Arizona
2
California
2
Canada
2
Colorado
2
Hawaii
2
Kilauea National Wildlife Refuge (Hawaii)
2
Kilauea Point
2
Utah
2
Alaska
1
Australia
1
China
1
England
1
Fiji
1
Great Basin
1
Livermore
1
Midlands
1
Montana
1
New Mexico
1
North America
1
Oklahoma
1
Pennsylvania
1
Rocky Mountains
1
Texas
1
West (U.S.)
1
Wyoming
1