Hynestia Prime, often shortened to just Hynestia, was a frigid, tundra-like planet with a cold environment. It resided within the Colonies region of the galaxy and had two moons in orbit around it. Because of its extremely cold temperatures, the human inhabitants could only live near the equator. Beneath the surface, the planet contained vast networks of caves along with geothermal hot springs.
The Hynestian royal family governed Hynestia. In the time of the High Republic Era, a Jedi temple outpost was established on Hynestia, with Jedi Master Stellan Gios in charge.