The Kingdom of Mu was once a major civilisation of Earth, populated by the naacal people. A great flood plunged their homeland into the ocean and the naacal people were forced into the lands of Asia where those who survived kept hidden from later species, such as humanity.
The Great Flood
The Kingdom of Mu was once a great nation on Earth until a great flood swept over their island home and plunged their great city into the ocean forever after. The naacal that survived the incident were forced into the forests and jungles of Asia where they remained hidden from other species throughout history[Pan 1].