The Richat Structure is also known as the Eye of the Sahara. It’s a distinct and prominent circular geographical feature in the Sahara Desert. At roughly 30 miles wide, you probably wouldn’t notice that you were within it, but from an aerial view – and even from space – it is highly visible. Originally, it was thought to be the product of an asteroid impact and later people thought it could have been created by a volcanic eruption.
海外旅行世界遺産 ハーン・ハリーリ（バザール） カイロ歴史地区の絶景写真画像ランキング エジプト
The Richat Structure or “The Eye of the Sahara” is...
Skunk Bear The Richat Structure or “The Eye of the Sahara” is... : NPR
The meteorite impact theory (generally agreed upon today) can not explain the flatness of the "crater"'s floor, so the next most accepted explanation is the erosion of the initial volcanic dome, which gradually peeled away original layers of rock, creating the present onion-like form. This image was taken by an Expedition 15 crew member on the International Space Station:
The "Eye of the Sahara" in Mauritania, Africa. Taken August 28, 2013. KN from space.
liesegangpoisoning: Sheep Mountain anticline - Wyoming All kindsa goodies up in there! Belemnites, pentacrinus, gastroliths, “devil’s toenails”… geologist/paleontologist heaven.
Wanna see the perfect cake for your Grand Canyon wedding
Grand canyon cake. So the wedding theme is grand canyon... what.
Image credit: Travis Lupick . Dead Vlei Sossusvlei in Naukluft Park, Namibia http://reversehomesickness.com/africa/dead-vlei-sossusvlei-namibia/
Paesaggi alieni, ecco l'altra faccia della Terra
Il nostro Pianeta ha poco da invidiare ai paesaggi lunari o alle distese rosse di Marte. E non solo per la varietà dei panorami, visto che alcuni scorci sembrano visioni extraterrestri. Le strutture di Richat, in Mauritania - note anche come ''l'occhio del Sahara'' - sono solo un esempio: