The Planet of Fire was a planet located somewhere in the galaxy's Alpha or Beta Quadrants.
History and specifics[]
The Planet of Fire appeared red from orbit. Its desolate surface was covered with impact craters and prone to exposure from potentially lethal cosmic rays from its system's star. Notably, it was a source of zithium crystals. Lifeforms included a species of spider.
Early in the year 2267, the Starfleet starship USS Enterprise visited the planet during a confrontation with a D7-class Klingon battlecruiser. A landing party sought some of the zithium while trying to evade the spider. (TOS board game: Star Trek Game (UK))