Triangulum Galaxy

The Triangulum Galaxy (M33, or NGC 598) is the next closest spiral galaxy to the Milky Way Galaxy beyond the Andromeda Galaxy, located some 2,600,000 light years from the Alpha Quadrant at its closest point.

In 2364, the USS Enterprise-D was hurled to the far side of the Triangulum Galaxy by the Traveler during warp field tests. (TNG: "Where No One Has Gone Before")

Later in 2387 the USS Pioneer during the test of an expermental Transwarp slipstream drive was also hurled to the far side of the Triangulum Galaxy. Here they made first contact with the Sentrath Imperium, a major power in the far regions of the galaxy. (PNR: "Beyond The Final Frontier").