1 - Britain Empire - 52,2 mln. km2 (1922)
2 - Mongol Empire - 24,0 mln. km2 (1270—1368)
3 - Russian Empire - 23,7 mln. km2 (1867)
4 - Soviet Union - 22,4 mln. km2 (1922—1991)
5 - Spain Empire - 20,0 mln. km2 (1790)
6 - Tsardom of Russia - 19,0 mln. km2 (1721)