@caocao: The average countries are the size of the U.S. There are like several countries the size of this on one continent. There are two other continents besides Ishgar that are similar in size and they are all connected to an even bigger land mass not shown.
He was also triple the size of mountains in front of him which most likely puts him higher than 2km. Yes, there are canon scale and number to plug in for the size of Ishgar. The world is much bigger than our own.
Trying to scale the height of Aldron to the clouds is an impossible task to do.
Ok, if there are numbers for the size of Ishgar, then we could probably scale the world. Depending on, how we scale it after.
What i forgot: On the other point we have a far smaller War God who reach the clouds before:
I think we both agree that the Dragon is far bigger then the War God.