Thanks for the comments guys.
Have added 3 territories: Korea, Badhdad and Uigur to take he number up to a more playable 40.
Qwert: I am going on more detailed sources than wikipedia, and this is the best 'average' i can get for the extent of mongol territory in the mid 13th century. It did cover more territory at some points but this was either temporary, tributary nations or conquests which came much later (e.g. india).
Have changed siberia to bolgar and outer tibet to lhasa, thanks glee.
Also added more impassable borders.