Saudi Arabia sits on the largest sand sea on Earth, a desert the size of France, and still imports sand from Australia to build its towers. The reason is in the shape of every single grain

By: Luis Reyes

Saudi Arabia is, by area, mostly desert. The Rub’ al Khali, better known in English as the Empty Quarter, is the largest continuous sand sea on the planet, an ocean of dunes about the size of France that sits within easy reach of every construction site in the country. So if there is one raw material a Saudi builder should never have to buy from a foreigner, it is sand. Except that is exactly what happens. Saudi Arabia imports construction sand, and so do the United Arab Emirates and Qatar, because the sand under their feet is close to useless for the single most important job in modern building: making concrete. The dunes are the wrong kind of sand. And the distance between how much sand the planet assumes it has and how much it can actually build with has grown wide enough that the United Nations now has a name for it.

The Grains Are the Wrong Shape

Concrete is mostly aggregate, meaning sand and gravel, held together by a thin matrix of cement paste. For that matrix to do its job, the grains have to lock against one another, edge to edge, so the cured block resists being pulled apart. River sand and crushed-rock sand are good at this because they are geologically young: broken off larger rock, jagged, angular, full of sharp faces that bite into the cement and into each other.

Desert sand is the opposite. Wind does not break sand, it polishes it. Grains that have spent thousands of years rolling and bouncing across the dunes get worn down into smooth, near-spherical pellets. Drop those into a wet concrete mix and they behave a little like ball bearings, sliding past each other instead of interlocking, leaving microscopic voids and weak seams through the finished material. You can build a garden wall with the stuff. You cannot build a supertall tower or a kilometer-long bridge.

Then there is the salt. Desert and beach sand often carry enough chloride to corrode the steel reinforcement inside concrete, which is its own slow-motion disaster for anything load-bearing. Engineers have spent years trying to make desert sand usable. A team out of Imperial College London developed a material called Finite, a concrete alternative made from desert sand, and there are patents for crushing and re-fracturing dune grains under enormous pressure just to give them edges again. None of it has displaced the simplest fix, which is to put good sand on a boat and ship it in.

The Sand Trade Runs Through a Handful of Countries

Buildable sand comes from a short list of places with lots of water-eroded reserves and the ports to move it economically. According to the Observatory of Economic Complexity’s sand trade data, the two largest sand exporters on the planet are the United States, which sold about $472 million worth in 2024, and Australia at roughly $268 million. Australia has held that number-two spot for years, and a chunk of what it digs up ends up in the Persian Gulf. Saudi Arabia, the UAE, and Qatar all buy graded construction and silica sand from suppliers in Australia, China, Belgium, and elsewhere.

The dollar amounts on the Saudi side are almost comically small. Trade data put the kingdom’s 2023 sand imports from Australia at around $140,000. That is not a typo and it is not a fortune; it is roughly the price of a mid-range pickup. The number is not the point. The point is that the line item exists at all, that a country sitting on one of the largest sand deposits on Earth has a budget line for buying sand shipped in from the other side of the world. Multiply that logic across every glass tower, every stretch of highway around Riyadh, and every dredged island, and the trickle of imports becomes the visible edge of a very large dependency. Ports like Jebel Ali and Dammam quietly handle sand the same way they handle containers of cars and electronics, and almost nobody notices.

An Island Built From Sand the Desert Couldn’t Provide

The clearest illustration is sitting off the coast of Dubai. The Palm Jumeirah, the palm-tree-shaped artificial island finished in 2006, was built almost entirely out of sand and rock, with no structural concrete in the reclaimed land itself. Putting it together took around 94 million cubic meters of sand, placed by GPS-guided dredgers using a technique called rainbowing, and that sand could not come from the desert a few miles inland. It was dredged from specific spots on the floor of the Persian Gulf where the grain size was right. Dutch and Belgian dredging firms ran the operation around the clock for years.