Utopia Planitia (also called the Utopia Planitia Basin) was a region on the planet Mars, home to the city of Utopia Planitia and the ground-based facilities of the Utopia Planitia Fleet Yards.
The Utopia Planitia Base was founded in 2069. (Star Trek: Star Charts)
- Star Trek Star Charts also asserts that the city of Utopia Planitia was the capital of the Martian Colonies, while the TOS novel: The Captain's Daughter asserts that Ares City was the capital.
The region suffered severe damage in 2410 when debris from Utopia Planitia Fleet Yards, destroyed by an Iconian bomb, fell from orbit. (Bait and Switch: "Mhirrafv Terrhai, Part II")