Region
Africa
3
Alaska
3
Australia
3
Yellowstone National Park
3
Antarctica
2
Michigan
2
Tanzania
2
Asia
1
Canada
1
Europe
1
Great Barrier Reef (Qld.)
1
Highlands (Scotland)
1
Isle Royale
1
Isle Royale (Mich.)
1
Isle Royale National Park
1
Isle Royale National Park (Mich.)
1
Kaibab Plateau (Ariz. and Utah)
1
Namib Desert
1
Namib Desert (Namibia)
1
Namibia
1
North America
1
Okavanga River Delta
1
Prince William Sound
1
Ross Island (Ross Sea)
1
Serengeti National Park
1
Serengeti National Park (Tanzania)
1
Serengeti Plain
1
South America
1
Svalbard (Norway)
1