Region
- United States 28 results
- India 6 results
- Africa 2 results
- Colorado 2 results
- England 2 results
- Gulf States 2 results
- Isle Royale National Park (Mich.) 2 results
- Kenya 2 results
- Mono Lake Region (Calif.) 2 results
- Niwot Ridge 2 results
- Poole Harbour 2 results
- Scandinavia 2 results
- Serengeti National Park (Tanzania) 2 results
- South Africa 2 results