Karachi is the largest city, seaport and the financial capital of Pakistan. It is the twentieth largest city of the world in terms of metropolitan population, and is Pakistan's premier centre of banking, industry, and trade. Karachi is also the home of Pakistan's largest corporations that are involved in entertainment, arts, fashion, advertising, publishing, software development and medical research. It also serves as a major hub of higher education in South Asia, and the wider Islamic World.
Karachi enjoys its prominent position due to its geographical location on a bay, making it the financial capital of the country. It is one of the fastest growing cities of South Asia. It was the original capital of Pakistan until the construction of Islamabad, and is the location of the Port of Karachi and nearby Port Bin Qasim, one of the region's largest and busiest ports. The city's population has increased dramatically after the Partition of British India forced hundreds of thousands of Urdu speaking "Mohajirs" (refugees from India) to settle in the city. Since independence from Britain in 1947, the city's vibrant economy has attracted migrants from all over Pakistan, surrounding countries such as Iran, Tajikistan, Myanmar, Bangladesh, Afghanistan and further beyond. Despite a history of political turmoil, the city continues to attract those seeking prosperity and has shown consistent growth.
Karachi city is spread over 3,530 km² (1,363 sq mi) in area. It is locally known as the "City of Lights" for its liveliness, and the "City of the Quaid" having been the birth and burial place of Quaid-e-Azam Muhammad Ali Jinnah, the founder of Pakistan, who also made the city his home after Pakistan's independence.