How much of our planet is covered by oceans?
There are over 510 million square kilometres of area on the surface of Earth, but less than 30% of this is covered by land. The rest is water, in the form of vast oceans.
This visualization by http://visualcapitalist.com

Breakdown of Countries Share of Earth's Surface
The largest countries by surface area are Russia (3.35%), Canada (1.96%), and China (1.88%). Together they occupy roughly 7.2% of Earth's surface.
Antarctica, although not a country, covers the second largest amount of land overall at 2.75%. Meanwhile, the other nations that surpass the 1% mark for surface area include the United States (1.87%), Brazil (1.67%), and Australia (1.51%). The remaining 195 countries and regions below 1%, combined, account for the other half of Earth's land surface.
The remaining 70% of Earth's surface is water: 27% territorial waters and 43% international waters or areas beyond national jurisdiction.
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