Mu


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

Mu is the continent that Upper Yard is located in.

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

Trivia

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