Maelstrom

The Maelstrom is a Warp Materium intersection, much like the Eye of Terror. It is a place where the warp spills out, creating storms and currents, making the region very unstable. It is an easy way to access the warp without the need for a warp engine, but it is likely infested with daemonic beasts clawing at the edges of space, looking for an unwary ship who's crew can be possessed.

It is located in the Ultima Segmentum, near to the infamous Badab system. It is mainly used by Chaos Space Marine regiments hiding from Imperial forces, including the Tyrant of Badab and his Astral Claws legion.