The Dasht-e Kavir, is one of two deserts dominating the
region's landscape, is a mix of sand and salt as blinding in its whiteness as
it is deafening in its silence. Dasht-e Kavir, is also known as “Kavir-e Namak”
and “Great Salt Desert”, is a large desert lying in the middle of the Iranian
plateau, around 300 kilometers east-southeast of Tehran. Dasht-e-Kavir desert
is approximately 800 kilometers long and 320 kilometers wide, and composed of
mud and salt marshes. Millions of years ago, this region was occupied by a
salt-rich ocean that covers a small piece of continent in what is now central
Iran. As the time passes, the ocean gets dried up, it left behind a layer of
salt as much as 6 to 7 kilometers thick.
Therefore, over the time, the layer of salt was buried under
a thick layer of mud; however salt has a fairly low density lower than the
layer of mud and rocks underneath which the salt layer lay. So it taking place
pushing up through the overlying sediment and finally, over millions of years,
the salt broke through and formed domes. The salt domes of Dasht-e Kavir are
probably some of the best examples of this geological marvel. Thus, geologists
have recognized about 50 large salt domes in this region. Some of the domes
have been eroded away by wind and rain exposing its cross-section.
However, the desert climate is arid and receives little rain
and snow each year, but the surrounding mountains on all side, provide plenty
of runoff to create vast seasonal lakes, marshlands and playas. Temperatures
can reach 50 °C in summer, and the average temperature in January is 22 °C. Though
it looks like a firm surface, the salt crust is only a few inches thick, below
which lies soft grease-like mud the Iranians called “Charbeh” that is really
difficult to get out of if one were to get stuck. Due to arduous travelling to
Dasht-e Kavir, it is very dangerous. The soil is sterile and not appropriate
for cultivation. In summer the hot temperatures cause extreme vaporization,
which leaves the marshes and mud grounds with large crusts of salt. Heavy
storms frequently occur and they can cause sand hills reaching up to 40 m in
height. Some parts of Dasht- e Kavir have a more steppe-like appearance.
Dasht-e-Kavir desert is almost uninhabited and only partly
explored. Wild sheep, camels, goats and Persian leopards also live in the
mountainous areas. Hence, human settling is restricted to scattered oases,
where wind-blocking housing constructions are raised to deal with the tough
weather conditions. Some live in the hills and the surrounding mountains. Against
the odds, oases exist within these desolate environs, home to villages that are
sustained by the wells of sweet water that have been part of desert mythology
for centuries. Vegetation in the Dasht-e Kavir is adapted to common plant
species like shrubs and grasses can only be found in some valleys and on
mountain tops. So, the most widespread plant is mugwort. The Persian ground jay
is a bird species living in some parts of the desert plateaus, along with
Houbara bustards, Persian gazelles, camel, goats, leopards, larks and
sandgrouses.
Moreover night life brings on wild cats, wolves, foxes, and
other carnivores, the Persian onager and Asiatic cheetah can be seen. Lizards
and snakes live in different places in the central plateau. The extreme heat and
storms in Dasht-e Kavir cause extensive erosion, which makes it almost
impossible to cultivate any lands almost uninhabited and knows little
exploitation. Camel and sheep breeding and agriculture are the sources of
living to the few people living on its soil. For irrigation, Iranians developed
a sophisticated system of water-wells known as qanats. These are still in use,
and modern globally used water-revenue systems are based on their techniques.