Earth from Space: image of the week

[Whitters]

The ever-shifting sands of the Sahara desert cover a large section of Mauritania. They all but obscure the remarkable Guelb Richat or Richat structure, although its heart remains clear like a bulls-eye in the middle of this Envisat image.

Read more:

http://www.esa.int/export/esaEO/SEMXH3WJD1E_index_0.html