The Boötes Void, colloquially known as "The Great Nothing," is an enormous, nearly spherical region of space in the constellation Boötes. Spanning approximately 330 million light-years across, it is one of the largest known "supervoids" in the observable universe. Its center lies roughly 700 million light-years away from Earth.
https://en.wikipedia.org/wiki/Bo%C3%B6tes_Void