Answer:
At its greatest extent, the Mongol Empire was one of the largest empires in history, covering a vast area of land that stretched across much of Asia and into Europe.
The empire reached its greatest extent during the reign of Kublai Khan, who was the grandson of Genghis Khan. At this time, the Mongol Empire covered an estimated 24 million square kilometers (9.3 million square miles) of land, making it the largest contiguous empire in world history.
To put this into perspective, the Mongol Empire was more than twice the size of the Roman Empire at its height and four times the size of the Alexander the Great's empire. The empire spanned from modern-day Korea in the east to Hungary in the west, and from Siberia in the north to Afghanistan and the Himalayas in the south.
It's worth noting that the Mongol Empire was not a uniformly controlled territory, and various parts of it were ruled by different leaders and subordinates of the Mongol Khan. However, the vast size and reach of the empire were a testament to the incredible military and administrative skills of the Mongol leaders.
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