The Clacis sector existed as a territorial division within the Outer Rim Territories, specifically located to the southwest of both the Raioballo sector and the world of Lah'mu.
The Clacis sector received a mention within the current Star Wars canon through the StarWars.com article titled "Where in the Galaxy Are the Worlds of Rogue One?." This article was authored by Mark Newbold and made available on January 31, 2017.
Within the Star Wars Legends continuity, the Clacis sector initially appeared in Alliance Intelligence Reports, a sourcebook from 1995 for Star Wars: The Roleplaying Game by West End Games. This sector was visually represented on a map created by Modi and subsequently included in the 2009 reference work, The Essential Atlas. The StarWars.com Online Companion for The Essential Atlas later situated the Praya system within the Clacis sector, effectively establishing the planet of Praya's presence in an in-universe video advertisement featured in the 1989 Star Tours theme park located in Tokyo, Japan as the earliest known appearance of the Clacis sector.