Innerpeace and Outlands

Inner (インナー) and Outer (アウター) are terms from the Mega Man ZX series that refer to the safety of a location. The former refers to safe areas, countries habited by people, while the latter refers to a lawless wilderness with dangerous Mavericks that are avoided by the countries.

In Mega Man ZX, areas from the map with a blue outline represent Inner areas, while areas with a red outline represent Outer areas. This doesn't appear to apply to the Mega Man ZX Advent map as Inner and Outer aren't mentioned and the Mysterious Lab uses both colors.