The Denotreas belt was an asteroid belt in the Alpha Quadrant. In 2374, Captain Daniel was sent to track down a suspected Changeling on Flortarios III during the Dominion War. After tracking the Changeling for some time, Daniel followed it to the Denotreas belt, where he, along with Seifer, Jadzia Dax, and Odo, apprehended the Changeling and handed it over to Starfleet Security. (Star Trek: Phoenix-X: "Home, Part II")