Mount Ihu

From Lego Bionicle

Mount Ihu was a high snow-and-ice capped mountain in the center of Mata Nui. It was named by Nuju in honor of Ihu, his late Matoran mentor. Kopaka found his first Kanohi mask, the Hau, on Mount ihu, and later spied the other Toa gathering from there using his Akaku. It would eventually become a place where Kopaka would go to be alone and think.