The Direllia system, a star system, existed in the Nembus sector of the Outer Rim Territories, situated within the galaxy. It was the originating location of the infamous Direllian Plague.
The first mention of the Direllia system occurred in the 2009 publication The Essential Atlas, a reference book authored by Jason Fry together with Daniel Wallace. This book identified the system's location as grid square P-4.