Region
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Tunisia
3
Utah
3
Virginia
3
Africa, Southern
2
Amazon River Region
2
America
2
Anne Arundel County
2
Antarctica
2
Bahia (State)
2
Boise Ridge
2
Caribbean Area
2
Costa Rica
2
Developing countries
2
France
2
Georgia
2
Great Basin
2
Great Lakes Region (North America)
2
Guiana Highlands
2
Hong Kong
2
Iowa
2
Ireland
2
Kings Canyon National Park
2
Kings Canyon National Park (Calif.)
2
Mackenzie River
2
Madagascar
2
Marquesas Islands
2
Maryland
2
Michigan
2
Middle Atlantic States
2
Montana
2
Nevada
2
New Mexico
2
Northwest Territories
2
Northwest, Pacific
2
Oceania
2
Pacific Islands (Trust Territory)
2
Panama
2
Pennsylvania
2
Philippines
2
Polynesia
2
Potomac River Valley
2
Rocky Mountains Region
2
Saint Helens, Mount (Wash.)
2
Sequoia National Park
2
Sequoia National Park (Calif.)
2
Shenandoah National Park
2
Society Islands
2
Sonoran Desert
2
South Australia
2
Spain
2
more ...