The Flumes are a mysterious underground river system found beneath the 99 Caverns. It bares some resemblance to sewers.
Closely affiliated with the Underriver, the Flumes is an underground tunnel that was once used as a highway in the 99 Caverns. However with the increase in pirate activity, the Flumes were abandoned and forgotten, but since then, activity has slowly increased with logging operations and becoming a byway for the Shane Gang.
- Feral Slughounds
- Undertow (First appearance)
- The Journey Home
- Getting Around in Slugterra (Slugisode Appearance)
- Pack Your Slugs! (Slugisode Appearance)