Region
United States
17
North America
4
Cold regions
2
Southwestern States
2
Africa South of the Sahara
1
Africa, Eastern
1
Africa, Sub-Saharan
1
Antarctica
1
Australia
1
Awash River Valley
1
Awash River Valley (Ethiopia)
1
Boston
1
Canada
1
Canada, Eastern
1
Caribbean Area
1
Ethiopia
1
Great Britain
1
Great Lakes (North America)
1
Long Island
1
Massachusetts
1
Mediterranean Region
1
New England
1
New York (State)
1
Northwestern States
1
Pacific Area
1
Polar regions
1
Rocky Mountains
1
Southern States
1
Sweden
1
West (U.S.)
1