Geography of India of the world's most intensely farmed areas. The main crops grown are rice and wheat, which are grown in rotation. Other important crops grown in the region include maize, sugarcane and cotton. The Indo-Gangetic plains rank among the world's most densely populated areas. The Thar Desert (also known as "the deserts") is by some calculations the world's seventh largest desert, by some others the tenth. It forms a significant portion of western India and covers an area of . The desert continues into Pakistan as the Cholistan Desert. Most of the Thar Desert is situated in Rajasthan, covering 61% of
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