Magellanic Clouds
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The Magellanic Cloud are two dwarf galaxies (referrred to as the Larger Magallenic Cloud and Smaller Magallenic Cloud) in galactic orbit around the Milky Way Galaxy.
The Larger Magallenic Cloud is the location of Eternity, one of the first human colonies outside the Milky Way galaxy. Eternity held its status as furthest of the "great colonies" for several centuries. (BBCR: The Last Voyage). The Magellanic Cloud was less than three light-centuries from Ribos. (DW: The Ribos Operation)
Around 2570, the Sontarans were engaged in a conflict in the Magellanic Cloud. (NA: Love and War)