Deep Core (Earth-2356)

"Sorry, Artoo, but I've never jumped into the Deep Core before. It's crowded in there and things move fast and this isn't a well-established route yet, so I think an abundance of caution is warranted."

- Luke Skywalker, to R2-D2

The Deep Core, sometimes referred to as the Core of the Galaxy, is a brightly lit region of the galaxy that lies at its very heart. A densely packed mass of stars and planets, the Deep Core is dangerous to navigate and largely left alone by galactic explorers. At its center exists an ancient, supermassive black hole that bound the galaxy together. Travelling towards the Core and away from the galactic rim is referred to as going "coreward."

Source

 * https://starwars.fandom.com/wiki/Deep_Core