What is the approximate diameter of the Virgo Supercluster, described as a flattened system?

About 110 million light-years

The Virgo Supercluster is recognized as an immense structure that historically defined our large-scale neighborhood, preceding the modern understanding of Laniakea. It is named after the central Virgo Cluster, which itself contains over a thousand galaxies. Quantitatively, the Virgo Supercluster spans a very significant distance across space, officially documented to be roughly 110 million light-years in diameter. This scale is vastly larger than the Local Group (which is only about 10 million light-years wide), but it is still considerably smaller than the contemporary measurement for the encompassing Laniakea Supercluster, which is estimated to be over 500 million light-years wide.