Few landscapes on earth look as strange from above as the Richat Structure — a near-perfect 40-kilometre-wide geological bullseye in the Mauritanian Sahara, nicknamed the Eye of the Sahara. It's remote, it's difficult to reach, and it's one of the most extraordinary sights a serious desert traveller can add to their list.
What is the Richat Structure?
The Richat Structure is a huge, concentric circular rock formation visible clearly from satellite imagery, located in the desert near Ouadane, Mauritania. On the ground it's far less obviously "bullseye-shaped" — you experience it as dramatic rings of eroded rock and colour rather than the perfect circle seen from space.
The science (and the myths)
Geologists broadly agree the structure is the result of an uplifted dome of rock that has been symmetrically eroded over millions of years, exposing concentric rings of differing rock types — not, as some popular theories once suggested, an impact crater or the lost city of Atlantis. The Atlantis theory in particular remains a popular but unproven idea with no accepted scientific or archaeological support.
Where it is and how to get there
The Richat Structure sits in the Adrar region of Mauritania, roughly 40km from the historic town of Ouadane. There's no public transport to the site — reaching it requires a 4x4 and a local guide who knows the desert tracks, typically arranged from Atar or Ouadane.
Atar, Chinguetti and Ouadane as bases
Atar is the main regional hub with the nearest airport and basic infrastructure. Chinguetti and Ouadane, both historic caravan towns and UNESCO-listed for their ancient libraries and architecture, make atmospheric bases closer to the structure itself and are worth visiting in their own right.
Visas and permits for Mauritania
Entry requirements for Mauritania change periodically, so always check current visa rules with an official source or your operator before travelling — historically most nationalities have needed a visa, obtainable on arrival at some borders/airports or in advance depending on nationality. Travelling with a licensed local guide or operator is strongly recommended for both logistics and any regional permit requirements.
Best season to visit
Cooler months (roughly November to March) are far more comfortable for desert travel here, similar to the Moroccan Sahara — summer heat in the Mauritanian interior is extreme and best avoided.
What a guided trip looks like
A typical visit combines a flight or overland journey to Atar, several days exploring Chinguetti, Ouadane and the surrounding desert by 4x4, and a dedicated excursion to view and explore the Richat Structure itself, often combined with a broader Mauritania or Morocco-to-Senegal overland itinerary.
FAQ
Can you see the Richat Structure's circular shape from the ground? Not clearly — its famous bullseye appearance is best appreciated from satellite images or aerial photos; from the ground you experience dramatic rock rings and colour.
Is Mauritania safe to visit? Check current government travel advisories before planning; travelling with an established local guide/operator is strongly recommended given the remoteness and limited infrastructure.
How many days should I allow? Most guided trips to the Richat Structure and surrounding area take a minimum of 4–5 days from Atar.
