Edit:plus besides the title it says so in the description, the ones with the most area part of the roman empire. Not all country of which at least a little bit was part of the empire. The are only 15 spots, if the amount of land is not big enough it is not on it.
Like a quiz biggest landanimals, with 10 spots, you wouldnt ask where is the flea?? well yes it lives on land... but has no place in the top