Atlantis, Lemuria and Mu from Google AI:

 

Let me introduce you to the reader of my point of view having been raised around people who believed in all three of these places. 

My understanding is that Mu was where the Hawaiian Islands are now and was about the size of Australia.

Whereas when Mu Sunk (likely from an interplanetary war) what was left was Lemuria(a colony of Mu) so we lost intergalactic Travel because all our intergalactic travel scientists and workers died on Mu. So, then on Lemuria we had Solar System Travel but had lost the basis of the technology of inter Galactic Travel.

Lemuria was and Is from Baja California up to Oregon. However, I believe Washington and Canada were still recovering from an Ice age then which seem to happen at least once every 25,000 years or so. 

begin quote from Google AI:

Atlantis, Lemuria, and Mu are legendary or mythical lost continents often discussed together, but they are distinct concepts. Atlantis is typically associated with the Atlantic Ocean, Lemuria with the Indian Ocean, and Mu with the Pacific. While some theories propose they are different names for the same place or that one evolved from another, they are generally considered separate entities in popular imagination. 

Atlantis:

• Location: The Atlantic Ocean, often depicted between Europe and North America. 

Mythology: Atlantis is a popular trope in fiction and is often portrayed as a technologically advanced civilization that was destroyed by a cataclysmic event. 

Lemuria:

Location: The Indian Ocean, with some theories placing it also in the Pacific. 

Origin: Lemuria originated as a scientific hypothesis in the 19th century to explain the distribution of lemur fossils and species, suggesting a land bridge between India and Madagascar. 

Mythology: It evolved into a mythical continent with its own lore, sometimes seen as a more ancient civilization than Atlantis. 

Mu:

Location: The Pacific Ocean. 

Origin: First introduced by Augustus Le Plongeon, later popularized by James Churchward, who believed it was the source of civilization and a precursor to other lost continents. 

Mythology: Mu is often described as a vast continent with advanced technology and spiritual knowledge, ultimately destroyed by a cataclysm. 

Key Differences and Connections:

Scientific vs. Mythical:
Lemuria began as a scientific concept, while Atlantis and Mu are primarily mythical constructs. 

Ocean Location:

Atlantis is primarily associated with the Atlantic, Lemuria with the Indian and Pacific, and Mu with the Pacific. 

Destruction:

All three are described as being destroyed or submerged by cataclysms, though the details vary. 

Interchangeability:

Some theories suggest that Lemuria and Mu are essentially the same place or that one is a misunderstanding of the other. 

Origin: First described by Plato in his dialogues, Atlantis is depicted as a powerful maritime nation that fell due to hubris.