In a remarkable discovery, scientists from the European Space Agency (ESA) have taken notice of a massive red stain stretching several kilometers across the arid landscapes of Morocco. Captured by the Copernicus Sentinel-2 satellite, this vivid reddish band stands out dramatically against the brown hues of the desert terrain in Ouarzazate, located in the central-southern part of the country. At first glance, this phenomenon might seem puzzling; however, there lies a much more natural explanation behind this striking visual.
The image, which was taken in January 2026 and published by the ESA on February 20, forms part of its 'Earth from Space' series. Although it appears as though a large expanse of land has been painted red, the reality is that the landscape does not possess that color. Instead, the satellite has captured the lush vegetation thriving alongside the rivers and agricultural areas of the region, employing a technique that reveals surface details invisible to the naked eye.
The secret behind this captivating image lies in the near-infrared spectrum, a section of the electromagnetic spectrum that plants reflect with notable intensity. To create this extraordinary visual, scientists processed the satellite data using a combination of bands that convert this information into visible colors. Consequently, areas with denser vegetation are portrayed in brilliant red, while dry terrains retain shades of brown and ochre.
What might seem like a mere visual effect is, in fact, a widely used tool in Earth observation, known as false-color imaging. This technique allows researchers to study vegetation density and health, identify agricultural surfaces, and analyze how ecosystems evolve over time.
The Role of Water Behind the Mysterious Stain
But why does vegetation stand out so prominently in this specific region of Morocco? The answer lies in the availability of water. The image was captured in January, during the wet season, when the region's seasonal rivers tend to carry larger volumes of water, promoting the growth of plants and crops along their banks.
Moreover, the unique shape of the red stain is not coincidental. Its intricate branches trace the paths of rivers and their tributaries, creating a sort of green network that permeates the semi-arid landscape. The contrast with the dry surroundings allows for a clear distinction of areas where water presence encourages the flourishing of vegetation and crops, which predominantly cluster along the riverbeds.
The image also captures other characteristic elements of the region. To the south, part of the Anti-Atlas mountain range is visible, while north of the main red band lies the city of Ouarzazate, situated in the valley of the river bearing the same name. To the east, the El Mansour Eddahbi reservoir appears depicted in black within this composition.
Approximately ten kilometers north of the city, one can also identify the Noor Ouarzazate solar complex, a sprawling facility covering over 3,000 hectares dedicated to solar energy production.
Thus, what from space appears to be a mysterious red stain is, in reality, a detailed examination of the vegetation flourishing in the heart of Morocco's arid landscape. This image, beyond its spectacular appearance, highlights the vital role of satellites in studying the Earth's surface, as it enables scientists to investigate how vegetation is distributed across a territory marked by water scarcity.
As reported by 20minutos.es.
