Approximately 80 of Earth's land remains unexplored.
All the earth's land surface has been discovered. There are parts that are virtually unexplored, however.
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Antarctica was the last continent to be discovered, based on its inaccessibility. Early explorers discovering land masses on planet earth sailed in ships that were not suitable for polar sailing. Because of its size and extreme elements, much of Antarctica remains unexplored today.
Deserts make up 33% of the Land's surface
Alaska has the nickname: The Last Frontier. Space has the nickname: The Final Frontier (see Star Trek). By The Last Frontier, it is meant the last area of habitable land on earth that is largely unexplored. The Ocean is vastly unexplored, but not too habitable for mankind. Antarctica too is mostly unexplored, but it also is not too habitable for mankind.
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Roughly 75% of Earths Surface is covered by water. (including the Oceans, lakes and land Ice).
About one third of the land surface of the earth is desert.
Plains regions cover about 55% of the Earth's land surface.
Deserts cover 33% of the land surface of the earth.
Antarctica is considered the least explored continent due to its harsh climate and remote location. Much of the continent remains untouched and unexplored, with vast areas still left to be discovered and studied.