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 than The 99 Caverns.
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 Clanners
- Ice Ogres
- Stone Warriors (not natural natives)
However, not all these species can be found in all SlugTerran realms.
In the underground world of SlugTerra there are many types of plants to be found.
- Mushrooms: Which are large than normal and can be found all over SlugTerra.
- Coral: A rough aquatic plant found at the bottom of the ocean floor of caverns like Undertow Cavern and is a great place for AquaBeeks to hide.
- Grasping Seaweed: A seaweed that rapes around things and found at the bottom of the ocean floor of caverns like Undertow Caverns.
- Vinedrill Blossoms: A flower that grows on Vinedrill vines and can be found mainly in Serenity Cavern.
- Peach Blossom Trees: Trees that sprout pinkish flowers called Peach Blossoms and are found in Peach Blossom Spring Cavern.
- 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
- The Deep Caverns - technically not apart of SlugTerra but still part of the underground, this is the home of the Darkbane.