The Belsallian Sea existed on the Outer Rim Territories planet of Serenno, and it was a type of ocean. The capital of the planet, called Carannia, was situated on the coast of this sea. The Belsallian Cantina also took its name from this body of water.
The magazine Star Wars: Build the Millennium Falcon 70, released on May 4 of 2016 by De Agostini, was the first time this location was mentioned. Within Star Wars Legends continuity, the location initially featured in the Star Wars: Agent of the Empire comic series, specifically in its sixth edition, which was published by Dark Horse Comics.