Hidden Land or Kingdom

Atlantis
Nick Name
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Indigenous Inhabitants
Humans
Immigrant Inhabitants
Homo mermanus
Notable Planets or Celestial Bodies
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Notable Cities
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Notable Structures or Monuments
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Notable Residents
Byrrah
Krang
Lady Dorma
Namor the Sub-Mariner
Namora
Namorita
Orka
Resources
Resourses of ancient Atlantis.
Special or Unusual Properties
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Regularly Appearing

Marvel Mystery Comics

Namor

Namora

Sub-Mariner Vol. 1, 2 & 3

Tales to Astonish  Vol. 1
First Appearance
Motion Picture Funnies Weekly #1 (April, 1939)

Marvel Comics #1 (Nov. 1939)

Note: Along with the Sub-Mariner Atlantis first appeared in an eight-page story in Motion Picture Funnies Weekly, a black and white promotional give-away intended to be distributed at movie theatres by the Funnies Incorporated studio.  The project was aborted and the seven of only eight samples created to send to theater owners were discovered in the estate of publisher Lloyd Jacquet in 1974.

The original eight-page origin of the Sub-Mariner, created by Bill Everett, were expanded to 12 pages and printed in Marvel Comics #1, the first retail comic published by Timely Comics, later renamed Atlas then Marvel Comics.
Creator

Bill Everett

Note: The myth of Atlantis was first mentioned in literature by the Greek philosopher Plato in a parable about the perils of worshiping false gods.
Origin
In ages past a samll continent in the Atlantic Ocean became the cradle of an advanced civilization known as Atlantis.  When an earthquake caused the continent to sink into the ocean the civilization died, but their structures and technology remained upon the ocean floor until it was discovered by an aquatic offshoot of humanity over 10,000 years ago, giving rise to an undersea Atlantis.