User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6050823-20130311000250/@comment-5963861-20130311015150

Well it could be that the native people of this region/continent made these particular ruins in the different environments of their homeland as some sort of homage to a particular god or gods. These ruins could also possibly be remains of an ancient civilization that had different cities in these particular environments. But thats just my view, they could be relatively close to eachother as you believe.