User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5020152-20121014204849/@comment-74.193.207.108-20121014205757

@Cottonmouth255 Here is how I see it the continents/regions had land bridges in the past that allowed some creatures to migrate to new lands. An example of this are lions as fossils of lions have been found in Europe and North America and they currently reside in Africa and some parts of Asia. The 4th generation region most likely was connected to the 1st/2nd gen continent and 3rd gen continent hence seeing returning monsters in the game. I hope that was a good enough explanation for you fella :)