The Karavian Trench, situated in the ocean of the planet Castilon, was an underwater feature. This trench served as the native habitat for rokknas, gigantic tentacled beings specific to that world. During 34 ABY, Synara San, a pirate of Mirialan descent, recovered a Z-95 Headhunter from the Clone Wars period, formerly the property of Reaper Squadron, from within the Karavian Trench.
The initial reference to the Karavian Trench appeared in the article "Bucket's List Extra: 9 Fun Facts from "Bibo" – Star Wars Resistance," published on StarWars.com on January 14, 2019.