What country is the world's largest empire?

-World's Greatest Empire as one single land under one authority and at one time, was the mongol empire (25,000,000 square meters) -World's greatest empire as one single land divided into authorities is the : Russian Empire.

Britain had the worlds largest Empire, spanning 33.7 million kilometres with a quarter of the worlds landmass and people under its control.

Britain was also the first muchanized, developed and urbanised country in the world and had naval as well as economic leads over other major powers for approximatly 400 years, asserting its dominance after the Napolionic wars of 1803-15.

-World's greatest empire as number of population is the British empire.

-World's greatest empire as one land but over time is the British empire

-And world's biggest ancient empire is the Arab/Muslim empire