The great empire, which consists of Britain and its dominions, colonies, possessions, trusteeship and protectorates, is the largest country in history and the largest colonial empire in the world. The empire reached its peak in the early19th century, with a population of about 400 million to 500 million, accounting for a quarter of the world population at that time. The territory is about 33.67 million square kilometers, accounting for a quarter of the world's total land area. /kloc-After the Spanish Empire in the 6th century, it was called "the sun never sets".

Second place: Mongolian Empire

The Mongolian Empire is a great empire spanning Eurasia in history, an extension of the former Great Mongolia, and the most extensive country in the world history. The area of the Mongolian Empire is as high as 33 million square kilometers (12.7 million square miles), accounting for 22% of the world's land area, more than one fifth, 1.5 times that of the Soviet Union in the 20th century and 65,438 times that of Russia today.