The Thar—or Great Indian—Desert is the most densely populated desert in the world and has been inhabited for thousands of years. Huge windblown seas of sand dominate the desert with some dunes reaching close to 500 feet in height. Extreme temperature shifts, from near freezing to more than 120 degrees, make life difficult for all who call the Thar home.
Because of its lack of water and good routes, the Judean wilderness has been (mostly) uninhabited throughout history. The Judean Desert is bordered by the Mountains of Judea to the west and by the Dead Sea to the East. It is considered a relatively small desert, spanning only 1,500 square kilometers. Mountains, cliffs, and chalk hills stand alongside plateaus, riverbeds, and deep canyons.
The Namib Desert is often referred to as the world's oldest desert and has been in existence for some 43 million years, remaining unchanged in its present form for the last 2 million years. The Namib is an immense expanse of relentlessly moving gravel plains and dunes of all shapes and sizes that stretch along the entire coastline.