Gamma Hromi II
The Hromi Cluster was a region of space near the Acamar system, where a number of M-class planets were located, including Gamma Hromi II. The Federation had charted, but not explored, several of these planets. In 2366, the USS Enterprise-D entered the Hromi Cluster to locate a Gatherer camp. (TNG: "The Vengeance Factor")
According to the Star Trek: Star Charts, on page 61, the Hromi Cluster was located in the Beta Quadrant. Later, on page 62, this cluster was recognized as one that the USS Enterprise either passed through, or was near to, when the starship was on a diplomatic mission to Kronos in 2293.