Star Wars: Echo
At the very heart of the galaxy, the Deep Core, also known as the Core Systems, is a region that spans seven thousand light years, and contains roughly 30 billion stars. Due to the gravitational pull of the vast number of stars, as well as a massive black hole at the center, local space-time is severely warped, making hyperspace travel difficult at best. The region is thought to be almost inaccessible until the Empire found several safe hyperlanes into the region, the majority of which are blocked or heavily patrolled by the Empire.
The Core Worlds, also known as the Imperial Core, are some of the most prestigious, well-developed, well-known, least politically restrictive and heavily populated planets in the galaxy. The Core is the hub of galactic culture, finance, technology, education, and fine arts. Noble houses hold a great deal of influence in this region and almost every interstellar company has offices or are headquartered in the Core Worlds. In astrophysical terms, the Core denotes the central area of the galaxy, and in broad terms this is true enough, but the precise usage of the term is sometimes more complex.
The major Rimward hyperlanes radiate outwards around little more than half the galactic disk, and the Core Worlds occupy a C-shaped region of space around the Deep Core, the heart of the astrophysical core (generally considered to be a separate outlier area), extending outwards towards the Unknown Regions.
Notable Systems: Imperial Center, Alderaan, Caamas, Corellia, Duro, Kuat
The Colonies is the name given to the region of the galaxy between the Core Worlds and the Inner Rim. It is among the first areas outside the Core to be colonized, and the worlds here are typically heavily populated, industrialized, and cultured.
The Galactic Empire is extremely present in this region, often acting as military dictator in some systems.
Notable Systems: Cato Neimodia, Commenor, Fondor
The Inner Rim is the region of the galaxy between the Colonies and the Expansion Region. It was originally just called “The Rim”, as it was expected to be the farthest extent of the known galaxy for centuries, but the Expanded Rim (later renamed the Expansion Region) was opened within a hundred years of the Inner Rim.
The Galactic Empire ruthlessly controls the Inner Rim. Rather than rebel, many residents choose to flee to the Outer Rim Territories.
Notable Systems: Dorin, Hapes, Onderon
The Expansion Region was an experiment in corporate-controlled worlds, with powerful corporations exploiting and profiting heavily from the planets for their raw materials, metals and ores. Inhabitants are oppressed while the corporations strip entire stellar systems of all their resources. Eventually civil unrest spread from system to system. The Galactic Republic eventually took control of the system due to mounting pressure from its denizens by limiting or evicting corporate interests. Expansion Region worlds continued to be producers of raw materials and ores. However, most natural resources are requisitioned by the Empire.
Notable Systems: Gamor, Ithor, Ord Mantell
With fewer natural resources (and therefore a smaller population) than many neighboring regions, the Mid Rim is a territory where residents work hard for everything they have. Several planets have built up impressive economies, and pirate raiders often hid in the relatively unexplored spaces far from major trade routes.
Notable Systems: Bothawui, Falleen, Kaskyyyk, Naboo
Outer Rim Territories
The Outer Rim Territories is the last widely settled expanse before Wild Space and the Unknown Regions. It is strewn with obscure worlds, and rugged, primitive frontier planets. Due to its distance from the Core, the region is home to many supporters of the Rebel Alliance. The Empire’s Grand Moff Wilhuff Tarkin has been assigned the difficult task of bringing the entire Outer Rim in line.
Notable Systems: Dac, Dantooine, Kessel, Mandalore, Nal Hutta, Ryloth, Tattooine
The Tingel Arm is an exterior spiral arm of the galaxy. It contains the Corporate Sector Authority, a political entity which is partially independent of the Galactic Empire. Under the Galactic Empire, the sector has expanded from a few hundred to thirty thousand systems.
Wild Space is the frontier of galactic society, separating the known parts of the galaxy from the Unknown Regions. Wild Space differs from the Unknown Regions in that some of Wild Space has been explored, though not extensively; the Unknown Regions remained mysterious.
The term “Unknown Regions” most commonly refers to the large, unexplored region—which some interpreted to have been outside the plane of the galactic disk—between Bakura and Yaga Minor. The Unknown Regions is comprised of only a few billion stars, out of a galactic total of 400 billion. There is a lack of reliable hyperspace routes through the region. The "Unknown Regions” designation also includes uncharted areas in dense nebulae, globular clusters, and the galactic halo. Past the region’s outer edge, including the seven dwarf satellite galaxies, is the hyperspace disturbance beyond the edge of the galaxy.