Sand Sea

 

 

 

 

 

 

In southwestern Libya, near the borders of Algeria and Niger, lies a sand sea known as Idhan Murzuq (also Sahra Marzuq) that rarely receives water from either sky or land. The extreme desert’s complex dunes are shaped by dry winds. But extending from the northeast quarter, a corridor of sand lines what used to be a river channel: Wadi Barjuj.

— from NASA’s Earth Observatory