Before the events of Slugterra: Ghoul from Beyond, the "SlugTerra" term was previously used to describe The 99 Caverns, however since then it's been discovered that SlugTerra is a much larger place than previously thought and consists of many more Cavern sets.
SlugTerra is largely populated with Humans and Slugs, however it's also home to a number of other species, both humanoid and otherwise.
- Cave Trolls
- Shadow Clan
- Ice Ogres
- Stone Warriors (not natural natives)
However, not all these species can be found in all SlugTerran realms.
- Main article: Jobs
- Slugslinging: Technically not a job, but it's a skill with much to offer in other professions and opportunity for others as well.
- Security Slinging: Often disparagingly referred to as "mall cops", Security Slingers are a close-knit group who uphold justice in malls across SlugTerra and take their jobs very seriously.
- Slingersmithing / Blastersmithing: Design, build and repair blasters.
List of SlugTerras
- The 99 Caverns - These were the series' original setting(s) and the home of Pronto, Kord and Trixie, and are/were protected by Eli & his family
- The Eastern Caverns - These are the series' current setting(s) and are the home of Junjie and were/are protected by Junjie & his family
- Main article: The Gateways#Destinations (Other Realms)
- The Deep Caverns - technically not apart of SlugTerra but still part of the underground, this is the home of the Darkbane.