Iljar is a settlement on the Cardassian planet Harkoum. Most of its residents who live there do so only temporarily and stay indoors during Harkoum's daylight hours due to the extreme heat. It was the location of a starport that many ships arrived on and left Harkoum from.

In 2377, Grauq arrived in Iljar and waited there for the mirror Iliana Ghemor to arrive and steal a ship to leave the planet in. Grauq believed she would steal the Otamawan from the Iljar spaceport in the town and kept a close watch on it. Ghemor later arrived in the town, but commandeered Grauq's own ship, the Githzarai, and used it to leave Iljar. (DS9 novel: Warpath)

the planet Cardassia
cities and settlements	Delrat • Drav • Fanehr City • Cardassia City (Akleen sector • Barvonok sector • Coranum sector • Imperial Plaza • Munda'ar sector • Paldar sector • Tarlak sector • Torr sector) • Culat • Lacoria City • Lakarian City • Lakat • Pogar City
landmarks and institutions	Bamarren Institute for State Intelligence • Central University • Mador Base • University of Culat • Setkar Base
nations and provinces	Morfan Province • Rogarin Province
continents	Eheen • Elar • Kraness • Nokar • South Forbella • Toleen
geography	Ba'aten Peninsula • Droneth Mountains • Eastwall Mountains • Girav Mountains • Helta Highlands • Kelden Mountains • Mekar Wilderness • Opuuya Mountain Range • Valley of the Hebitians • Vorcal Mountains
bodies of water	Bay of Kinar • Kriil Ocean • Margat Sea • Morfan Sea