Where I can find high-res public domain images of Countries or Continents on the web I found this one of Africa:



That one is nice because it's > 3000x3000px which is large enough. I have looked around a bit for ones of these countries but haven't found anything that is large/high quality, free/public domain, and free of clouds/weather like the Africa image:


United States
Russia
China
India
Mexico/Central America
South America
Canada
Greenland/Iceland/Arctic
Europe
Australia
Southeast Asia
Japan


I would like to find these broad areas as images on a high quality satellite image similar to this Africa one.
You can find satellite images free of clouds at chinesse version of google maps. 

Under the rigth toolbar, top icon, you need to uncheck the first layer with the geographical names and click on the satellite image button, and you can place the view to see maps as this one of Southamerica.