The Jarnollen system was a stellar neighborhood in the Mid Rim of the galaxy, specifically within the Bright Jewel sector, and it housed the planet known as Jarnollen; all of this information is from Star Wars Legends.
This Jarnollen system was initially conceived for the Star Wars Legends newspaper comic strip titled The Bounty Hunter of Ord Mantell. Archie Goodwin wrote it, and Al Williamson provided the artwork. This comic strip was published between February 9 and April 19 of 1981. The system's location was later specified as grid square L-7 in The Essential Atlas, a reference work by Jason Fry and Daniel Wallace, which was made available on August 18, 2009. The star system was made for legends.