The Thar Desert is a large, arid region in the northwestern part of the Indian subcontinent and forms a natural boundary running along the border between India and Pakistan. With an area of more than 200,000 km2 (77,000 sq mi), within the Indian state of Rajasthan, covering the districts of Jaisalmer, Barmer, Bikaner and Jodhpur, and some region of the states of Punjab, Haryana and Gujarat. it is the world's 9th largest subtropical desert.There are a number of salt water lakes in Thar desert. These are Sambhar, Pachpadra, Tal Chhapar, Falaudi and Lunkaransar where Sodium chloride salt is produced from salt water. The Didwana lake produces Sodium Sulphate salt. Ancient Archaeological evidences of habitations have been recovered from Sambhar and Didwana lakes which shows their antiquity and historical importance.The Thar Desert is mainly inhabited by Hindus, Muslims, and Sikhs. The portion in Pakistan is inhabited by primarily by Sindhis and Kolhis. A colourful culture rich in tradition prevails in this desert. The people have a great passion for folk music and folk poetry.About 40% of the total population of Rajasthan state live in the Thar desert.