Bel City existed as an aquatic metropolis situated on the Outer Rim planet of Mon Cala, submerged underwater. During 18 BBY, Ferren Barr, a Jedi Padawan, along with his band of adherents, were discovered within a submerged underwater cave by the Galactic Empire's Inquisitors, who were under the command of the Dark Lord of the Sith known as Darth Vader. In an attempt to escape, Barr and his companions sought refuge in Bel City, hoping to secure passage away from the planet.
The initial depiction of Bel City occurred in Darth Vader (2017) 16, a canon comic book from 2017 authored by Charles Soule and visually brought to life by Giuseppe Camuncoli.