Draanis IV was a planet, the fourth planet in the Draanis star system located in the space of the galaxy's Delta Quadrant. Though capable of supporting humanoid life, it had an atmosphere thick with volcanic ash, making any view of the stars from the surface a rare occurrence. It also possessed a subspace-warped gravity well, making it a navigational hazard for space vehicles.
In the 21st century, a Trevin ship crashed on Draanis IV. The survivors were able to find shelter underground and create a viable community. In the 23rd century, Draanis IV was annexed by Dernovin, and the Trevin enslaved.
In the 24th century, the crew of USS Voyager were captured by members of the Trevin Resistance Movement, who implanted false memories in them being stranded on Draanis IV for four years, and placed them in a holodeck recreation of the planet. (VOY - Strange New Worlds I short story: "Fiction")