Jaisalmer lies in the heart of the Thar Desert and is famous for the Jaislamer fort constructed of yellow limestone. The sandstone gives a yellowish-golden tinge to the city and gives it the epithet of the Golden City. Traditionally, the main source of income was the levies on the caravans. However, the glory of Jaisalmer faded when Bombay emerged as a port and the sea trade replaced the traditional land routes. The partition of India in 1947 lead to closing of all the trade routes on the Indo-Pak border and rendered Jaisalmer a drought-prone desert backwater on the international border. The 1971 Indo-Pak war gave a new lease of life to the oasis town and now it thrives on a booming tourism industry.