A. Atacama desert
B. Sahara desert
C. Namib desert
D. Gobi desert
Submitted by: Muhammad Irfan Sadiq
This extremely arid ecoregion comprises shifting sand dunes, gravel plains and rugged mountains. The world’s oldest desert, the Namib Desert has existed for at least 55 million years, completely devoid of surface water but bisected by several dry riverbeds.