Karhi Nui

Karhi Nui is the home of millions of Matorans. It is also the main place where the Kanohi Karhi rests, being named after the mask. Makuta Tagah's assigned region was here, until he turned against Makta himself, being a helper of the Matoran, and following a Makuta's duty.

This is the only region on Aqua Magna not buried atop of the Mata Nui robot, thus not being destroyed when Mata Nui rose. However, it crashed onto Bara Magna. It is unknown whether it's residents survived or not.

The Mask of Power
As Makuta sent Tagah to look for the Kanohi Karhi, it was being inhabited by Matoran and Rahi, including Visorak. When Tagah decided to do what was right instead of what was evil, the continent was invaded by Rahkshi, in which were defeated.