This Unnamed Galaxy was approximately four million light years away from the Milky Way. SG-1 accidentally traveled here when their hyperspace route was interrupted after destroying a sun. It was known to have had at least one ship equipped with beam weapons and shield in it, and a population of Replicators.
The presence of Replicators and the distance of four million light years both suggest that this may have been the Ida Galaxy. (SG1: "Enemies") Although it is possible that the Replicators might inhabit more than one galaxy, perhaps unbeknownst even to the Asgard.