Thar Desert natural vegetation of this dry area is classed as Northwestern thorn scrub forest occurring in small clumps scattered more or less openly. Density and size of patches increase from west to east following the increase in rainfall. The natural vegetation of the Thar Desert is composed of the following tree, shrub and herb species: The endemic floral species include "Calligonum polygonoides", "Prosopis cineraria", "Acacia nilotica", "Tamarix aphylla", "Cenchrus biflorus". The Thar Desert is the most widely populated desert in the world, with a population density of 83 people per km. In India, the inhabitants comprise Hindus, Muslims, and Sikhs. In
Thar Desert a year are cloud free. Solar energy based plant has been established at Bhaleri in Churu district to convert hard water into drinking water. 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. Water scarcity plays an important role in shaping life in all parts of Thar. Small, intermittent ponds, whether natural (tobas)