Hola Ahmed :
Only to say that everthing was perfectly organised in the whole trip , I really enjoy all the time in the desert, the different types until the Erg Ezzahar ( that is really beautiful; I like very much Erg Chebbi - specially the colours of the sand - , but here , there is much less people and the " sea " of dunes around the Main Dune is more beatiful than in Chegaga or Chebbi. Of course is my opinion ).
Saludos from a rainiy and cold Madrid