Hercules–Corona Borealis Great Wall
For comparison, the Milky Way, the galaxy we live in, measures only 200,000 light-years, and the distance from the Milky Way to the Andromeda Galaxy measures only 2.5 million light-years. The Huge-LQG (the Huge Large Quasar Group), the previous largest structure in the universe, is 4 billion light-years long.