Region
- United States 18 results
- Tropics 8 results
- Brazil 6 results
- Kenya 6 results
- British Columbia 4 results
- Acre 2 results
- Albania 2 results
- Amazon River Region 2 results
- Armenia (Republic) 2 results
- Azerbaijan 2 results
- Bicol (Region) 2 results
- Blue Ridge Mountains 2 results
- California 2 results
- Chimalapas Region 2 results
- Chimalapas Region (Mexico) 2 results
- Congo (Brazzaville) 2 results
- Developing countries 2 results
- European Union countries 2 results
- Fraser River 2 results
- Fraser River (B.C.) 2 results
- Georgia (Republic) 2 results
- India 2 results
- Macedonia (Republic) 2 results
- Mediterranean Region 2 results
- Mexico 2 results
- Moldova 2 results
- Northeastern States 2 results
- Northwest, Pacific 2 results
- Ontario 2 results
- Parc national de Nouabalé-Ndoki 2 results
- Philippines 2 results
- San Francisco Bay Area 2 results
- Southeast Asia 2 results
- Southern States 2 results
- Tanzania 2 results
- Uzbekistan 2 results
- Washington (State) 2 results
- West (U.S.) 2 results
- Wisconsin 2 results
- Yellowstone National Park 2 results