Why Saudi Arabia Is Building the Longest Artificial River on Earth Saudi Arabia is building one of the most ambitious water megaprojects in human history — an artificial river longer than the Nile. But why does a desert nation need the world’s longest man-made river? In this video, we explore: • The real purpose behind Saudi Arabia’s artificial river • How this massive water system works • Its connection to Vision 2030 and desert agriculture • Environmental, economic, and geopolitical impacts •