User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-6680436-20130531190450/@comment-4009941-20130531192546

Farthest south parts of the 1st, 2nd and Frontier gen is all desert and 3rd gen is on another continent that Capcom never gave a map for yet.

But it looks allot like these areas could be in the first continent by the monsters and ruins like the ruins in the Old jungle, Jungle and Tower. Also the Frozen Sea could be part of the northern continent Akura on the official 1st, 2nd and Frontier map.