The lost continent of Mu is a hypothetical ancient landmass proposed by 19th-century traveler and writer Augustus Le Plongeon. He claimed that Mu was a continent located in the Atlantic Ocean and that it was the site of an advanced civilization, similar to Atlantis. Le Plongeon's ideas were further popularized by James Churchward, who wrote extensively about Mu in the early 20th century. According to Churchward, Mu spanned a vast area and was home to millions of inhabitants before sinking into t