Is Neom the biggest project in the world?

I understand that Neom is a vast project with a proposed area of 26,500 square kilometers, but I have to ask, is it truly the biggest project in the world? How does it compare to other megaprojects around the globe, such as the One Belt One Road Initiative or the Channel Tunnel? Is it merely a case of semantics, or does Neom indeed boast the most significant scope, ambition, and potential impact? Furthermore, what sets it apart from other endeavors of its kind, and how will it revolutionize the world economy and our daily lives?