Mu is the name of a lost continent in Mayan mythology, according to the writer Augustus Le Plongeon. According to his translation of the Tro Codex (a book of Mayan lore):
"In the sixth year of Kan, the 11th of Mulua, the month of Zac, terrible earthquakes struck, which went on until the 13th of Cheen. The land of Mu was lost. Twice lifted and lowered again into the water, finally one night it sank for good. The volcanic forces shook the water, flooding the dry land in various places. Ten lands in the end sank beneath the water. Sixty-four million people perished… 8060 years before the writing of this book."