A Frontier World is one colonized by the Imperium, but not under it’s complete control. Most of these places have a government presence, but they are easily swayed to look away if needed. Most of these worlds are either setting out to become Ports, Forge Worlds, Agri-Worlds, or Hive Worlds, but are just barely starting out. They have an active society of great variety and many things can be found, if one knows where to look.
Frontier Worlds are noted on the map with red system markers.