Saudi Arabia has unveiled plans for one of the most ambitious water infrastructure projects in its history, aiming to create an artificial underground river that will transport desalinated seawater across vast desert distances to bolster the nation’s drinking water supply.

The initiative responds to the Kingdom’s chronic lack of natural freshwater sources and rapidly growing demand from urban populations, agriculture and industry.

Engineers and planners describe the project as a sprawling subterranean water network that could extend more than twelve thousand kilometres, surpassing the length of the Nile and representing an unprecedented scale in potable water infrastructure.

The design calls for a system of pipelines, pumping stations and anti-corrosion conduits that would carry millions of cubic metres of purified water from coastal desalination plants deep into the country’s interior, where groundwater scarcity has historically limited development and habitation.

The sheer size of the proposed route reflects both ambition and necessity, as Saudi planners seek to reach regions far from the Red Sea and Persian Gulf, where most desalination facilities are located.

At the heart of the scheme is Saudi Arabia’s position as a global leader in desalination technology.

With dozens of plants already operating along its coasts, the Kingdom produces more desalinated freshwater than any other country, a cornerstone of its long-term water strategy.

Experts say integrating these facilities with an extensive underground conveyance network would reduce reliance on diminishing aquifers and fossil groundwater, boost reliability in supply, and support future urban and agricultural expansion.

The initiative dovetails with broader national development goals, including Vision 2030, which prioritises sustainable infrastructure, economic diversification and resilience against climate extremes.

Officials and technical advisors caution that the project poses formidable engineering and environmental challenges, from maintaining pipeline integrity in arid terrain to managing energy demands associated with desalination and long-distance pumping.

Still, proponents argue that innovative water transport systems of this scale are necessary to secure freshwater access in some of the world’s driest landscapes.

As designs progress and feasibility studies deepen, the artificial river concept is viewed not only as a critical lifeline for Saudi communities but also as a potential model for water-stressed regions globally, where traditional river systems are absent and renewable supply sources must be engineered.