Karachi is the provincial capital of Sindh province and the largest city in Pakistan. It is also one of the largest cities in the world and is located on the northern shores of the Arabian Sea, west of the Indus River Delta. It was the original capital of Pakistan and remains the cultural and economic hub, as well as being the largest seaport of the country. Its leading economic sectors include finance, business services, transportation, media, television production, publishing, software, medical research, education and tourism.