The Magellanic Clouds are two satellite galaxies. Individually, they are known as the Large Magellanic Cloud and the Small Magellanic Cloud.
The homeworld of the Hive species was in the Magellanic Clouds. After another species began to conquer the Magellanic Clouds, the Hive left the galaxy and headed for the Milky Way Galaxy. (DS9 novel: Objective: Bajor)