Region
United States
135
Canada
28
France
27
Congo (Democratic Republic)
9
Luxembourg
6
Morocco
6
Gabon
5
Senegal
5
Belgium
4
Comoros
4
Côte d'Ivoire
4
Chad
3
Djibouti
3
Mali
3
Mexico
3
Monaco
3
Outer space
3
Togo
3
Algeria
2
Bandiagara Caves (Mali)
2
Benin
2
Burkina Faso
2
Burundi
2
Cameroon
2
Great Britain
2
Guinea
2
Madagascar
2
Niger
2
Niger River Valley
2
Tropics
2
Bulgaria
1
Central African Republic
1
Czech Republic
1
Estonia
1
Europe
1
Great Lakes (North America)
1
Great Lakes Watershed (North America)
1
Haiti
1
Hungary
1
Japan
1
Kyoto
1
Latvia
1
Lithuania
1
Matagorda Bay
1
Mauritania
1
North Dakota
1
North Macedonia
1
Poland
1
Romania
1
Roquefort-sur-Soulzon (France)
1
more ...