Karachi () is the largest city in Pakistan and the capital of the province of Sindh. Until 1958 it was also the capital of Pakistan it is also called the city of lights. It is also one of the world's megacities. After 1958 the ISLAMABAD became the capital of Pakistan. In 2017 about 17.63 million people lived in Karachi. It is the largest city in the Muslim world.<ref name="kp" 