<Tr> <Th> Plant </Th> <Td> thorn scrub forest </Td> </Tr> <Tr> <Th> Animal </Th> <Td> Chinkara </Td> </Tr> <P> The Thar Desert, also known as the Great Indian Desert, is a large, arid region in the northwestern part of the Indian subcontinent that forms a natural boundary between India and Pakistan . It is the world's 17th largest desert, and the world's 9th largest subtropical desert . About 75% of the Thar Desert is in India, and the remaining 25% is in Pakistan . In India, it covers about 320,000 km (120,000 sq mi), forming approximately 10% of the total geographic area of India . More than 60% of the desert lies in the state of Rajasthan and extends into Gujarat, Punjab, and Haryana . This desert comprises a very dry part, the Marusthali region in the west, and a semidesert region in the east with fewer sand dunes and slightly more precipitation . </P> <P> The Thar Desert extends between the Aravalli Hills in the north - east, the Great Rann of Kutch along the coast and the alluvial plains of the Indus River in the west and north - west . Most of the desert is covered by huge shifting sand dunes that receive sediments from the alluvial plains and the coast . The sand is highly mobile due to strong winds occurring before the onset of the monsoon . The Luni River is the only river integrated into the desert . Rainfall is limited to 100--500 mm (3.9--19.7 in) per year, mostly falling from July to September . </P>

What is the extent of the thar desert
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