Supremacy

The Supremacy was a Mega-Class Star Dreadnaught built by the First Order that served as the flagship and mobile base of Supreme Leader Snoke. One of the largest starships ever constructed, it was heavily damaged in battle against The Resistance during the events of Star Wars: The Last Jedi.

Description
At a whopping 60 kilometers wide and 13 kilometers long, the Supremacy was the largest starship in the First Order's fleet. Indeed, it was the largest starship ever built, even outclassing the Super star destroyer of the Galactic Empire.