Wildspace

Wildspace is the area contained within a Crystal Sphere And it extends a distance outside of the Crystal spheres as well, there are paths through the phlogiston that are part of the wildspace as well.
note:

Spelljamming ships and their helms are among the best magic items in the Spelljammer setting but aren't without complications. Spelljammers each have an air envelope and gravitational force. When this gravitational pull interacts with that of another Spelljammer, commotion ensues.
According to Spelljammer: Adventures in Space, when two gravity planes overlap, the gravitational force of the entity with the most hit points takes precedence. So, if one ship touches a second, the first ship could alter the other's gravity, making the second ship's crew scramble to stay aboard.