Thar Desert

Thar Desert

The Thar Desert, also called the Great Indian Desert, is a dry, sandy place in the north-west of the Indian subcontinent. It covers parts of India and Pakistan, spanning 264,091 km² (101,966 sq mi). Most of it lies in the state of Rajasthan, with some areas in Gujarat, Haryana, and Punjab. To the west, it extends into the provinces of Sindh and Punjab in Pakistan.

Long ago, during the Last Glacial Maximum, large ice sheets covered the Tibetan Plateau. This changed the weather, causing less rain and more dust. Over time, the land grew drier, rivers dried up, and the area became a desert. Today, the Thar Desert has sandy plains and small hills. It has very hot summers and cool winters. Most rain comes from the southwest monsoon, but there is usually less than 500 mm (20 in) each year, and sometimes long dry spells.

Even in these tough conditions, the Thar Desert is home to many people, animals, and birds. The Thar people live in small villages and often move around. They rely on limited agriculture, raising animals, and eco tourism to live. The desert’s plants and animals have learned to survive with very little water.

Geography

The Thar Desert is in the north-western part of the Indian subcontinent. It stretches across the border between India and Pakistan. Most of the desert is in India, especially in the state of Rajasthan. It also covers parts of Gujarat, Haryana, and Punjab. In Pakistan, it is in 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, 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 flat ground.

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

The Aravalli mountains 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, 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 you go 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 on top of old sediments. Strong winds move the sand around each year. Underneath, the rock is mainly igneous and metamorphic rock.

The rocks change across the desert. In the south near Barmer, the oldest rocks are volcanic and contain 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 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. In the hot summer months from April to June, temperatures can get 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 comes 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

People have lived in the Thar Desert for a very long time. Ancient tools have been found there. The Indus Valley Civilization began near a river in the area thousands of years ago. After that civilization ended, new groups of people came and formed tribes and kingdoms.

Many empires ruled parts of the desert over time, 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. After India became independent, the desert was split between India and Pakistan, and many people moved 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. 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.

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 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 plants live here.

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.