Thar Desert

The Thar Desert, also known as the Great Indian Desert, is a dry and sandy area in the north-western part of the Indian subcontinent. It stretches across India and Pakistan, covering an area of 264,091 km² (101,966 sq mi). About two-thirds of it lies in India, mostly in the state of Rajasthan, with parts in Gujarat, Haryana, and Punjab. To the west, it reaches into the provinces of Sindh and Punjab in Pakistan.

Long ago, during the Last Glacial Maximum, big sheets of ice covered the Tibetan Plateau. This caused changes in the weather, leading to less rain and more dust. Over time, the land became drier, and rivers dried up, turning the area into a desert. Today, the Thar Desert has sandy plains and small hills, with very hot summers and cool winters. Most of the rain comes from the southwest monsoon, but it is usually less than 500 mm (20 in) each year, and sometimes there are long dry periods.

Despite the harsh conditions, the Thar Desert is home to many people, animals, and birds. The Thar people live in small villages, often moving from place to place. They depend on limited agriculture, raising animals, and eco tourism for their living. The desert’s tough plants and animals have adapted to survive with very little water.

Geography

The Thar Desert is found in the north-western part of the Indian subcontinent. It stretches across the border between India and Pakistan, covering an area of 264,091 km² (101,966 sq mi). Most of the desert, about 195,091 km² (75,325 sq mi), lies in India, especially in the state of Rajasthan, with parts also in Gujarat, Haryana, and Punjab. In Pakistan, it extends into the provinces of Sindh and Punjab. The desert is bordered by the Aravalli Hills to the northeast and the Indus River to the west and northwest.

Origin and formation

Long ago, during the Mesozoic era (252 to 66 million years ago), the area that is now the Thar Desert was low and flat, covered by shallow water. Over time, wind and water wore away the land, creating layers of flat ground.

When the Himalayas mountains rose up, they helped create the monsoon rains. But during a cold period called the Last Glacial Maximum, huge ice sheets covered nearby areas. This changed the climate, stopping monsoons from reaching the area. As a result, the land became drier.

The Aravalli mountains formed and grew taller, changing the rivers' paths. The Ghaggar-Hakra River, once linked to the Indus River, changed its course and no longer reached the sea. With less rain over time, the land turned into the arid Thar Desert we see today.

Topography and geology

The eastern part of the Thar Desert has sandy plains and low hills. As it moves toward the Aravallis, the land rises to about 325 meters high. To the west, near the border between India and Pakistan, the land gets lower, down to about 150 meters.

Much of the desert is covered in sand dunes made from wind-blown sand that collects on top of old sediments. Strong winds each year make the sand move around a lot. Underneath, the rock is mainly made from igneous and metamorphic types of rock.

The rocks change across the desert. In the south near Barmer, the oldest rocks are volcanic and contain a type called felsite. Near Pokhran, there are different colored shales. South of Jodhpur, you can find pale sandstones made mostly of quartz. There are also sandstones with fossils from the Jurassic period near Jaisalmer. In Jaisalmer, layers of sandstone and limestone with many fossils are used in buildings. Further west and northwest of Jaisalmer, there are dark sandstone rocks with calcium, topped with red sandstone and mixed with yellow ammonite rocks.

Climate and hydrography

The Thar Desert has a dry desert climate. During the hot summer months from April to June, temperatures can reach very high, often above 50 °C (122 °F). In the cooler winter months from December to February, temperatures can drop to around −2 °C (28 °F). Most of the rain falls during the rainy season from June to September, with yearly amounts usually between 100–300 mm (3.9–11.8 in).

The underground water level in the desert changes between 10–40 metres deep, and the water is often salty. The Luni River is the longest river in this area, with several smaller rivers joining it. There are also salt lakes such as Sambhar, Kharaghoda, Didwana, Pachpadra, and Phalodi. These lakes fill with water during rains and then slowly dry up. The long Indira Gandhi Canal brings water from the Indus River system to help with farming and provide clean water to drink. Small water storage systems like johads and taankas are also used to save rainwater.

History

Lithic tools from an ancient culture have been found in the Thar Desert, showing that people lived there long ago. The Indus Valley Civilization grew up near a river in the area thousands of years ago. After that civilization ended, new groups of people moved in and formed tribes and kingdoms.

Over time, many empires ruled parts of the desert, including the Mauryan, Kushan, Gupta, and Mughal Empires. Later, local Rajput states and other dynasties also controlled the area. In the 1800s, the British took control, and after India gained independence, the desert was split between India and Pakistan, causing many people to move between the two countries. Today, most of the eastern part of the desert is in the Rajasthan state of India, while the western part is in Sindh and Punjab provinces of Pakistan.

Demographics and economy

The Thar Desert is home to many people who have lived there for a long time. It is one of the most populated deserts in the world, with about 83 people living in each square kilometer. These people belong to different groups and follow different religions, such as Hindus and Muslims. They speak languages like Rajasthani languages, including Marwari, Sindhi, and Lahnda.

Many families in the Thar Desert live in small, mobile communities. Their homes are small huts shaped like a bee hive with cone-shaped roofs made from plants. In settled areas, homes have large open spaces in the middle and shaded areas around the edges. These buildings use local wood and clay to stay strong. The desert has very little water, so people collect rainwater and dig wells to survive. Life can be hard because of long dry periods and difficulty reaching other places.

People in the Thar Desert work with animals, grow crops where water is available, and make handmade goods. They grow crops that can survive with little water, like green gram, sesame, and millets. Near water, they also grow fruits and vegetables. The area has also started using solar power and attracting visitors who enjoy desert safari trips on camels.

Biodiversity

The Thar Desert has special plants and animals that have learned to live in its dry conditions. The desert has small patches of green plants, mostly shrubs and hardy herbs. These plants grow better as you move east, where there is more rain. Some trees grow in low areas, and many different kinds of plants call this desert home.

Animals in the Thar Desert include about 60 types of mammals, 51 kinds of reptiles, and eight kinds of amphibians. You can find animals such as the Chinkara, Desert fox, and Desert Cat. There are also many reptiles, like lizards and snakes, including some special ones only found in this area. Over 100 kinds of birds live here or visit, including the Great Indian Bustard and the Indian peafowl. The desert has several protected areas, like Desert National Park in India and Lal Suhanra Biosphere Reserve in Pakistan, where these plants and animals are safe.