Mu


 * Not to be confused with "MU", which is a commonly-used abbreviation of "Matoran Universe".

Mu was the continent that Upper Yard was located in.

History
In 150,081 CMT, Nefelpitou claimed that he owned artistic tools from "the Upper Yard of the Continent of Mu".

Trivia

 * It is possible that Mu was a reference to a fabled lost continent that was hypothesized to have existed in the real world.