An underwater cavern, like one that Slaggernacks is described as being in.

The Maw is a deep ocean trench where the light doesn't get to. It is inhabited by strange creatures and is a haven for exotic sea weed. Gray trained down here with Takiza, and an important clash between the [[Indi Shiver]] and the other shivers occured here in Into the Abyss. There was also Maredsoo, a kind of seaweed that makes you go realy fast.