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
Geological Survey of Pakistan notably carried out an ingenious work on nuclear geology and geography as part of the clandestine atomic bomb project, and played an integral role in the selection of the test sites. Throughout this time, the GSP's scientists continued exploring uranium and plutonium, as well as other material sources in all over the country. In 1992, The GSP announced the discovery of the huge deposits of coal at Thar Desert in Sindh. The GSP sponsored and published various studies on the geology of Thar Desert. In the 1990s, the GSP issued and produced several maps of atlas of Pakistan, with mapping