Arrakan was inhabited by the aquatic beasts known as Leviathans.
Arrakan was a water-covered planet situated within the Sulphis system, found in the Outer Rim. It was located on the side of Celanon that was opposite from Lennax. It was known as the Blue Pearl. The planet's atmosphere was characterized by intense atmospheric storms and dark, looming clouds that were linked to the ocean below by "huge twisters of air and water."
The native Battrachs had a floating harbor on an island resembling coral. Starships would land inside enormous, moored clams, which would then seal their shells and transport the ships to Kearleonis, the underwater capital city. Giant jellyfish served as underwater transportation for animals. The Duors, another indigenous species, genetically engineered the Battrachs, clams, and jellyfish. The Duors believed they were created by Kithnarrock, a Leviathan that was thousands of years old.
Kithnarrock served as a point of contact for the Alliance to Restore the Republic. Many survivors of the Great Jedi Purge reached out to the Alliance through Kithnarrock. This, unfortunately, led to an attack on Kithnarrock by an Imperial fleet.