Sources

Geography

In general: https://google.com
https://maps.google.com
https://www.wikipedia.org/
https://gadm.org/
https://en.wikipedia.org/wiki/Category:Lists_of_country_subdivisions_by_country

Islands:

https://en.wikipedia.org/wiki/List_of_islands_by_name_(B)

Canada

https://en.wikipedia.org/wiki/List_of_land_districts_of_British_Columbia https://en.wikipedia.org/wiki/List_of_municipalities_in_Quebec

Republic of Congo

https://en.wikipedia.org/wiki/Republic_of_the_Congo#Administrative_divisions https://en.wikipedia.org/wiki/Districts_of_the_Republic_of_the_Congo

Democratic Republic of the Congo

https://en.wikipedia.org/wiki/Provinces_of_the_Democratic_Republic_of_the_Congo https://en.wikipedia.org/wiki/List_of_cities_in_the_Democratic_Republic_of_the_Congo

Fiji

https://en.wikipedia.org/wiki/List_of_islands_of_Fiji

Mexico

https://en.wikipedia.org/wiki/Municipalities_of_[Estado]

Example:

https://en.wikipedia.org/wiki/Municipalities_of_Oaxaca

New Zealand

https://en.wikipedia.org/wiki/Regions_of_New_Zealand

Uganda

https://books.google.com.ar/books/about/Uganda_Districts_Information_Handbook.html?id=vQkOAQAAMAAJ&redir_esc=y

United Kingdom

https://en.wikipedia.org/wiki/Regions_of_England https://en.wikipedia.org/wiki/Subdivisions_of_England#Lists_of_subdivisions https://en.wikipedia.org/wiki/Subdivisions_of_Scotland#Council_areas https://en.wikipedia.org/wiki/Local_government_in_Wales#Principal_areas_of_Wales https://en.wikipedia.org/wiki/List_of_lochs_of_Scotland https://en.wikipedia.org/wiki/Vice-county

United States

https://en.wikipedia.org/wiki/List_of_islands_of_Alaska

Taxonomy

General:

https://resolver.globalnames.org/

Amphibians:

https://www.amphibiaweb.org/

Birds:

https://avibase.bsc-eoc.org/avibase.jsp?lang=EN

Fish:

http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp

Mammals:

https://www.departments.bucknell.edu/biology/resources/msw3/

Reptiles:

http://reptile-database.reptarium.cz/

Paleobiology

http://fossilworks.org/?a=taxonSearchForm