Where is Aquamarine Summit?

[nyaasar]

Just finished the normal game with characters level at 172 each. The after credit says that a new area(?), Aquamarine Summit, has appeared. I can't find it anywhere on the map, am I missing or misread something?

[chaoselement]

Aquamarine summit is what this game calls the 1mil dmg in one hit challenge. It's located in the guild along with the stat fruit farm challenge.