1. british empire (34,121,300 km sq)
2. the spanish (25,012,110 km sq)
3. mongols (23,005,002 km sq)
4. russian empire (22,990,900 km sq)
5. soviet union (22,402,200 km sq)
6. russian federation (17,075,400 km sq)
7. roman empire (14,112,139 km sq)
8. abbasics dynasty (13,997,210 km sq)...