Which continent is the flattest on Earth?

Australia is the flattest continent on Earth. Its terrain is dominated by broad low plateaus, interior plains and gently rolling landscapes rather than extensive young mountain ranges.

Australia’s unusual flatness reflects its long geological stability. Much of the continent has been part of the Australian tectonic plate for immense periods, with relatively limited recent tectonic uplift. Wind and water have therefore had millions of years to erode older highlands and smooth the landscape. Australia is also commonly described as the lowest and oldest continental landmass.

Its highest mountain, Mount Kosciuszko, rises to about 2,228 metres—modest compared with the highest peaks of other continents. By contrast, Asia contains Mount Everest, South America contains the Andes, and Antarctica contains the Transantarctic Mountains and the Antarctic ice sheet. Australia does have rugged regions, including the Great Dividing Range, but they occupy less of the continent and are generally lower and older than major mountain systems elsewhere.

“Flattest” does not mean completely level. Australia includes mountains, escarpments, deserts and deep river valleys. The claim refers to the continent’s overall relief and average elevation compared with other continental landmasses.