From the International Space Station, they look almost impossible: dozens of electric-blue rectangles blazing against the rust-red rock of the Colorado Plateau, hugging the dark-green bends of the Colorado River near Moab, Utah.
The contrast is jarring. This is one of America’s most remote desert landscapes — ancient, sun-scorched, deeply natural. Yet something down there is glowing in a shade of blue that has no business existing in the middle of it.
A scene almost too vivid to be real
On June 26, 2017, an astronaut aboard the International Space Station photographed something that looked more like abstract art than industrial infrastructure. The coordinates — 38.47°N, 109.68°W — place the image just 8 miles southwest of Moab, Utah, in the heart of the Colorado Plateau. What the camera captured was a series of 23 solar evaporation ponds, grouped into two larger structures, covering roughly 400 acres along the Colorado River.
The scale is significant, but it’s the color that stops you. The ponds blaze electric blue against the rust-red plateaus while the Colorado River winds through the frame in deep, sediment-heavy green. That visual tension between blue, red, and green is almost disorienting. The Colorado Plateau itself stretches across approximately 130,000 square miles of Utah, Colorado, New Mexico, and Arizona — ancient, elevated terrain shaped over millions of years by erosion and geology.
What is potash, and why does it end up in giant ponds?
The ponds exist because of potassium chloride — commonly called potash — a mineral with an outsized role in global agriculture. Its primary use is as a fertilizer, though it also turns up in medicines, cement, fire extinguishers, textiles, and even beer.
Extracting it near Moab involves pumping boiling water deep underground to dissolve mineral deposits and bring a rich brine to the surface. That brine is piped to the evaporation ponds, where sun and time do the rest, gradually reducing the liquid to small, brown potash crystals. The sun provides the energy, but the scale of the operation — and the strange visual byproduct it creates — is anything but routine.
The secret behind the electric-blue color
The blue isn’t natural, and it isn’t accidental. When a pond is freshly filled with brine, workers deliberately add a dark-blue dye to the water. The purpose is practical: the darker color absorbs more sunlight, which accelerates evaporation. In an operation where time is money and the sun is the engine, that boost matters.
As water levels drop, the dye concentration shifts and the dye itself gradually evaporates. The intense blue softens, fading through progressively lighter shades until it disappears entirely — the pond turns white, then tan, as dried potash crystals take over. What the ISS photograph captures isn’t a single color but a whole timeline. Each pond’s distinct shade indicates exactly where it sits in the evaporation process, making the array read like a color-coded progress chart from orbit.
From ‘pot ash’ to potassium: a surprisingly deep history
The word “potash” carries more history than its industrial present might suggest. It derives from “pot ash” — a preindustrial fertilizer made by combining wood ash with water, then boiling the mixture until only mineral residue remained. Laborious and low-tech, the process was practiced for centuries before modern chemistry gave it a proper name.
When scientists eventually identified the key active ingredient, they named the element after it: potassium. The naming acknowledged that farmers had been using this compound long before anyone understood what it actually was. That thread — from ancient wood-ash pots to underground brine extraction to satellite photography from orbit — is a reminder that some of our oldest agricultural practices are still very much alive, just operating at a vastly different scale.
Beauty with a cost: environmental concerns in the Colorado basin
Like all mining operations, potash extraction near Moab carries environmental consequences. Habitat destruction and noise pollution come with the territory. Potash mining also generates specific waste products — sodium chloride and clay sludge — that present their own challenges, typically stored in tailing pools near the mine site.
A 2017 study found that this sludge can wash into nearby waterways, with effects that may “significantly alter biological communities” and trigger harmful algal blooms. These aren’t trivial outcomes in an already water-stressed region. The Colorado River — the sixth-longest in the United States, stretching roughly 1,450 miles from the Rockies to the Gulf of California — is already under considerable pressure from drought, overuse, and climate change. The same ponds that produce a striking image from space sit inside one of the most ecologically fragile river systems on the continent.