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| Poseidonis | |
| Continuity: | DC Universe |
| Category: | City |
| Continent: | Atlantis |
| Residents: | Poseidonians |
Poseidonis is a fictional city featured in comic books published by DC Comics. It is associated with the Aquaman line of comic titles. Poseidonis is a domed underwater city and is the capital of the city-state and continent of Atlantis.