User blog comment:PitchBlack696/Blog: Admins Board/@comment-6050823-20131029023339/@comment-6050823-20131102034625

Here is some info on the "Forbidden Ground"(Still like "Forbidden Land" a bit more).

The reason why its forbidden is because of a incident that happened in the Heavenly Mountains. All of the monsters went crazy, became super violent, and pretty much killed each other in the land and, kinda died out. In legend it was said that "A god came from the heavens killing every living thing in the mountains". From it became a forbidden land and it became an area known by its name, the Forbbiden Ground.

There is another legend on Dara Amadyura on how it supposely made the Heavenly Mountains.

Source: MH4Info.com