Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Mount Mobius is a location mentioned in the Sonic the Comic series published by Fleetway Editions. It is a mountain on Mobius.
Due to never being seen, it is unknown what kind of mountain Mount Mobius is, although it is noted as being where Robotnik's Veg-O-Fortress resides.
When the Freedom Fighters fought against Dr. Robotnik's forces in an attempt to save the Emerald Hill Folk, Trusk informed them that once they were taken to Mount Mobius' Veg-O-Fortress and turned into Badniks, where they would finally be out of Robotnik's way. However, no one were actually brought to Mount Mobius due to the arrival of the Sky Pirates.