The Fantain Mountains existed on the desert planet of Zaloriis. These mountains provided a habitat for diminutive animal species, as well as the Zalorian rock-lions, because large rocks shielded them from the intense planetary winds. Before the Battle of Hoth occurred in 3 ABY, the Galactic Empire, which was the dominant power at the time, built a clandestine facility named Camp Culroon in proximity to the Fantain Mountains. This base was part of the development program for the All Terrain Armored Transport walker, also referred to as the AT-AT, and was overseen by Colonel Maximilian Veers.
The initial reference to the Fantain Mountains can be found within the 2001 video game Star Wars: Galactic Battlegrounds, created by LucasArts. They are mentioned in the Zaloriis databank entry, as well as the Imperial campaign's fourth level, "An Empire's Fury."