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The World's Largest Deserts


A map showing the generalized location of Earth's ten largest deserts and a table of 20 major deserts.

world desert map
This map shows the generalized location of Earth's ten largest deserts on the basis of surface area. The table at the bottom of this page provides the names, generalized locations and surface areas of over twenty major deserts. Base map by NOAA..


What is a Desert?



A desert is a landscape or region that receives very little precipitation - less than 250 mm per year (about ten inches). Approximately 1/3 of Earth's land surface is a desert. There are four different types of deserts based upon their geographic situation: 1) polar deserts; 2) subtropical deserts, 3) cold winter deserts, and 4) cool coastal deserts. As shown on the map above, deserts occur on all of Earth's continents.


The Largest Desert



The two largest deserts on Earth are in the polar areas. The Antarctic Polar Desert covers the continent of Antarctica and has a size of about 5.5 million square miles. The second-largest desert is the Arctic Polar Desert. It extends over parts of Alaska, Canada, Greenland, Iceland, Norway, Sweden, Finland and Russia. It has a surface area of about 5.4 million square miles.


Non-Polar Deserts



The rest of Earth's deserts are outside of the polar areas. The largest is the Sahara Desert , a subtropical desert in northern Africa. It covers a surface area of about 3.5 million square miles. A list of the twenty largest non-polar deserts can be found below.


The Desert Environment



When most people think of a desert they imagine a landscape covered with sand and sand dunes. Although many deserts are sand-covered, most are not. Many desert landscapes are rocky surfaces. They are rocky because any sand-size or smaller particles on the surface are quickly blown away. Rocky deserts are barren wind-swept landscapes.

Most deserts receive so little precipitation that surface streams usually only flow immediately after rainfall - unless the stream has a source of water outside of the desert. Streams that enter a desert usually suffer major water losses before they exit. Some of the water is lost to evaporation. Some is lost to transpiration (taken up by plants and then released to the atmosphere from the plants). And, some is lost to infiltration (water soaking into the ground through the bottom of the stream channel).


Desert Fauna and Flora



The plants and animals that live in a desert must be adapted to the environment. Plants must be very tolerant to intense sun, prolonged periods without precipitation and an ability to prevent moisture loss to conditions of severe temperature ranges, dry winds and low humidity.

Animals must be able to tolerate temperature extremes, temperature ranges and have an ability to survive with very little water. Many animals adapt to desert conditions by living underground and being active at night.
McMurdo Dry Valleys
The largest deserts on Earth are in the polar regions. This is one of the McMurdo "dry valleys" near Lake Hoare, Antarctica. The Canada Glacier is in the background. Photograph by Peter West, National Science Foundation.


sand dunes in the Sahara Desert of Libya
Most people think of deserts as "sandy" landscapes. That is true part of the time. This is a view of sand dunes in the Sahara Desert of Libya - an area known as the Awbari Sand Sea. Photo © PatrickPoendl, iStockphoto.


vegetation of the Sonoran Desert in Arizona
Most people think of deserts as "sandy" landscapes. That is true part of the time. This is a view of sand dunes in the Sahara Desert of Libya - an area known as the Awbari Sand Sea. Photo © vlynder, iStockphoto.


Major Deserts of the World

Name
Type of Desert
Surface Area
Location
Antarctic
Polar
5.5 million mi²
Antarctica
Arctic
Polar
5.4 million mi²
Alaska, Canada, Greenland, Iceland, Norway,
Sweden, Finland, Russia
Sahara
Subtropical
3.5 million mi²
Northern Africa
Arabian
Subtropical
1 million mi²
Arabian Peninsula
Gobi
Cold Winter
500,000 mi²
China and Mongolia
Patagonian
Cold Winter
260,000 mi²
Argentina
Great Victoria
Subtropical
250,000 mi²
Australia
Kalahari
Subtropical
220,000 mi²
South Africa, Botswana, Namibia
Great Basin
Cold Winter
190,000 mi²
United States
Syrian
Subtropical
190,000 mi²
Syria, Iraq, Jordan, Saudi Arabia
Chihuahuan
Subtropical
175,000 mi²
Mexico
Great Sandy
Subtropical
150,000 mi²
Australia
Kara-Kum
Cold Winter
135,000 mi²
Uzbekistan, Turkmenistan
Colorado Plateau
Cold Winter
130,000 mi²
United States
Gibson
Subtropical
120,000 mi²
Australia
Sonoran
Subtropical
120,000 mi²
United States, Mexico
Kyzyl-Kum
Cold Winter
115,000 mi²
Uzbekistan, Turkmenistan, Kazakhstan
Taklamakan
Cold Winter
105,000 mi²
China
Iranian
Cold Winter
100,000 mi²
Iran
Thar
Subtropical
75,000 mi²
India, Pakistan
Simpson
Subtropical
56,000 mi²
Australia
Mojave
Subtropical
54,000 mi²
United States
Atacama
Cool Coastal
54,000 mi²
Chile
Namib
Cool Coastal
13,000 mi²
Angola, Namibia, South Africa


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