Subject Region
United States
21
South Asia
5
Appalachian Region
3
Caribbean Area
3
Egypt
3
Southeast Asia
3
West (U.S.)
3
Arctic regions
2
Canada
2
China
2
Europe
2
Ganges River Delta (Bangladesh and India)
2
Germany
2
Guangdong Sheng (China)
2
Guangxi Zhuangzu Zizhiqu (China)
2
Netherlands
2
Northeastern States
2
Rhine River
2
Scandinavia
2
Southern States
2
West Indies, British
2
Africa, East
1
Amazon River Region
1
America
1
Antarctica
1
Ayacucho (Department)
1
Ayacucho (Peru : Department)
1
Bismarck Range
1
Brazil
1
Camp Lejeune
1
Camp Lejeune (N.C.)
1
Central America
1
Developing countries
1
Finland
1
Great Britain
1
Gwembe Valley
1
India
1
Indian Coast (Africa)
1
Indian Ocean Region
1
Ithaca (N.Y.)
1
Kentucky
1
Malaysia
1
Mann Gulch
1
Marshall Islands
1
Montana
1
Mozambique
1
New England
1
New Zealand
1
North America
1
North Carolina
1
more ...