What was the biggest empire in history?

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Beginning with the Akkadian Empire, the very first empire in the dark ancient era with a size of 0.8 million km2, empires have only grown in size, Alexander II expanded the Russian Empire to a huge 22.4 million km2, but this is not enough to claim the top spot. This prime position is held by the British Empire under George V in 1922 at an unparalleled 33.6 million km2. At almost a quarter of the Earth’s total land area, this gigantic empire prompted the famous saying, ‘the sun never sets on the British Empire.’