Eye of the Sahara
The Eye of the Sahara is the common name for the Richat Structure, a large circular geological feature in northwestern Mauritania.
The Eye of the Sahara is the common name for the Richat Structure, a large circular geological feature in northwestern Mauritania. It is an eroded geologic dome with concentric rings, not an impact crater, and is visible from space.
Geology
The Eye of the Sahara is a deeply eroded dome, also described as a domed anticline, with concentric rings of rock exposed at the surface. Geological accounts describe it as formed by uplift and later erosion rather than by impact.
Location and appearance
The structure is in the Adrar Plateau of Mauritania, in the western Sahara, where its circular pattern stands out against surrounding desert terrain. Its diameter is about 40 kilometres, making it large enough to be seen from space.
Scientific interpretation
Early interpretations considered it a possible impact structure, but later research found no evidence such as shocked quartz, melt rock, or shatter cones. The accepted explanation is that it is an uplifted and eroded geologic dome above older rock layers.
Public interest
The formation is widely photographed from satellites and the International Space Station because of its unusual bullseye appearance. It has become a well-known landmark in geology and Earth observation imagery.
Key facts
- It is one of the most recognizable circular landforms in the Sahara Desert.
- The structure’s rings are exposed by erosion of an uplifted dome.
- Scientific studies indicate it is not an asteroid impact crater.
- The feature lies near the town of Ouadane in Mauritania.
- NASA and the USGS describe it as a prominent geologic feature visible from orbit.
Canadian readers may know the Eye of the Sahara from satellite imagery, Earth science coverage, and International Space Station photography used in geology and geography education.
Frequently asked questions
What is the Eye of the Sahara?
Is it an impact crater?
Where is it located?
How wide is it?
Why is it called the Eye of the Sahara?
References
- NASA Earth Observatory — https://science.nasa.gov/earth/earth-observatory/the-eye-of-sahara-150060/Supports: Diameter, location context, visible from space, uplifted geologic dome interpretation
- U.S. Geological Survey — https://www.usgs.gov/media/images/richat-structure-mauritaniaSupports: Location, size, eroded sedimentary and volcanic rock, not an impact structure
- Live Science — https://www.livescience.com/planet-earth/geology/eye-of-the-sahara-mauritanias-giant-rock-dome-that-towers-over-the-desertSupports: Common names, concentric rings, general geological description
- Geoscopy — https://geoscopy.com/eye-of-the-sahara-the-richat-structure-explained/Supports: Not an impact crater, rejection of shock-mineral interpretation, age around 100 million years
- HowStuffWorks — https://science.howstuffworks.com/environmental/earth/geology/eye-of-the-sahara.htmSupports: Description as an uplifted geologic dome and size estimate