Cheelit

Cheelit was the homeworld of brain crawlers, a species of parasitic worm that could infest happabores.

Behind the scenes
Cheelit was first mentioned in Dark Lord's Conscience, a comic strip written by Alan Moore and first published in The Empire Strikes Back Monthly 155 in 1982. The location was confirmed to be canon by the replica journal Star Wars: Rey's Survival Guide, which was written by Jason Fry and released in 2015.