As we all know, the Mongol Empire was the largest continuous land empire in history (while the British Empire was larger, it was a maritime empire) but how big could the Mongol Empire get? What areas which the Mongols invaded historically but didn't conquer could have, under the right circumstances, been conquered by the Mongol Empire? Vietnam? Japan? Europe? India? Egypt? Indonesia? What would the extent of this Maximum Mongol Empire be?