A map of space surrounding the Ikalian asteroid belt
The Ikalian asteroid belt was an asteroid belt in the Kriosian system. Some of the asteroids had deposits of actinides.
In 2367, Kriosian rebels, fighting to regain their independence from the Klingon Empire, hid in the Ikalian asteroid belt, using the actinides to hide from sensor scans. While hiding in the belt, they attacked a Ferengi freighter and a Cardassian freighter. (TNG: "The Mind's Eye")
According to the script, the pronunciation for Ikalian was "ih-KAY-lee-n" [1]