Atlantis.

About Atlantis

Atlantis, sometimes also called the Kingdom of Atlantis or the Atlantean Empire, is a fictional civilization appearing in American comic books published by DC Comics, and based upon Plato's references to the island of Atlantis in Timaeus and Critias. First appearing in More Fun Comics #87, the setting is often associated with the hero Aquaman. Within the DC Universe, Atlantis houses various aquatic-based human lifeforms whose biological adaptations often originate from both environmental changes – after Atlantis sunk in a cataclysmic event – and influence from its magical origins. Considered a superpower, Atlantis is often stated to be among the oldest and most sophisticated civilizations in the fictional universe, and to possess significant technological and magical capabilities. Historically a hereditary monarchy, many stories involving Atlantis as a setting focuses on conflicts regarding its succession of leaders, diplomatic relations with the global world, and its fictional cultural heritage.