What was the approximate peak area of the Mongol Empire in km²?

The Mongol Empire reached an approximate peak area of 24 million km². Its greatest extent came in the late 13th century, when Mongol-ruled territories stretched across much of Eurasia, from the Pacific coast and Korea in the east to Eastern Europe and the Middle East in the west.

The empire began with Temüjin’s unification of the Mongol tribes and his proclamation as Genghis Khan in 1206. Successive campaigns under Genghis and his descendants expanded Mongol power across northern China, Central Asia, Persia, the Russian steppe, and parts of Eastern Europe. Kublai Khan’s conquest of the Southern Song completed Mongol control over most of China and helped produce the commonly cited maximum figure.

The number is an estimate, not a modern surveyed boundary. Historians differ over whether to count loosely controlled frontier zones, tributary territories, or lands claimed but not permanently administered. As a result, figures around 23–24 million km² are common, while some modern geospatial studies produce higher estimates depending on their definition of control. For a general-history quiz, however, 24 million km² is the standard rounded answer.

The Mongol Empire is usually described as history’s largest contiguous land empire. It later fragmented into major successor states, including the Yuan dynasty, Golden Horde, Chagatai Khanate, and Ilkhanate.