is the capital of Pakistan and the tenth largest city in the country. The population of the city has increased from 100 000 in 1951 to 1.21 million in 2009. The Rawalpindi-Islamabad Metropolitan Area is the third largest in Pakistan with a population of over 4.5 million inhabitants. Islamabad is located in the Pothohar Plateau in the north of the country within the Islamabad Capital Territory.