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 85% of the Thar Desert is in India, and the remaining part in Pakistan. In India, it covers about 320,000 km2 (120,000 sq mi), of which 90% is in Rajasthan and extends into Gujarat, Punjab, and Haryana.