Tales of Tolgard
Wildspace is the area around a planetary system. It usually extends twice as far out from the system’s primary star as the orbit of its farthest planet. Breaching the border of this area is difficult and portals appear through it only occasionally and often at seemingly random locations for a variable duration.
This is the area that most spelljamming ships ply their trade and seek out adventure. Only the bravest (or most foolish) spelljammer will risk their ship and crew on a journey beyond their home crystal sphere and travel through the phlogiston that exists between crystal spheres.