The Great Indian Desert, also known as the Thar Desert, is located in northwestern India. It is one of the largest subtropical deserts in the world, covering an area of over 200,000 square kilometers across the Indian states of Rajasthan, Haryana, Punjab, and Gujarat. The desert is mostly an undulating sandy plain covered with crescent-shaped sand dunes, and it has an arid climate with low vegetation due to low annual precipitation of less than 250 millimeters.