Jarnollen

Jarnollen was a planet in close proximity to Ord Mantell in the Outer Rim Territories. It was covered in tropical jungle, and its trees possessed overgrown vines. It was the location of an Imperial training center shortly after the Battle of Yavin.

Not knowing of the Imperial presence on the planet, Luke Skywalker and Leia Organa were dispatched to the world to scout its potential as a new Rebel base. They learned of the Imperial presence just as an Imperial patrol came upon their landed ship, destroying it with proton grenades and dispatching all available forces to track the Rebels down. The pair spent much of that night and dawn the next morning evading an Imperial AT-AR, before being rescued by Han Solo and the Millennium Falcon.

Behind the scenes
The planet was unnamed in the original comic, and remains unnamed in canonical sources. However, material written by Pablo Hidalgo for the Star Wars Adventure Journal would have named this planet Jarnollen, had the Journal not folded. This article, "The Jarnollen Expedition," would have followed historian Voren Na'al's research of the planet, and would have detailed the fauna and microbiota of the planet, as well as explained the reasons for the Empire's presence there.