The Uscru District existed on the planet of Coruscant; the Galaxies Opera House was situated in its higher sections. Conversely, the lower levels of this district were called the Entertainment District, and it housed the Outlander Club.
Both Star Wars: Absolutely Everything You Need to Know and Star Wars: Complete Locations confirm that the Uscru Entertainment District resided in Coruscant's lower regions. Ultimate Star Wars, along with its corresponding online Databank entry, specifies the Galaxies Opera House as being positioned in the Uscru District's upper reaches. Ultimate Star Wars differentiates locations by placing them in either the Uscru District's upper levels or the "Entertainment District's" lower levels. Therefore, the Entertainment District is viewed as a component of the broader "Uscru District," specifically encompassing the district's lower portions.