Karachi (Urdu: کراچی; ALA-LC: Karācī, IPA: [kəˈraːtʃi] ( listen); Sindhi: ڪراچي) is the capital of the Pakistani province of Sindh. It is the most populous city in Pakistan, and third most populous city proper in the world. Ranked as a beta world city, the city is Pakistan's premier industrial and financial centre. Karachi is also Pakistan's most cosmopolitan city. Situated on the Arabian Sea, Karachi serves as a transport hub, and is home to two of Pakistan's two largest seaports, the Port of Karachi and Port Bin Qasim, as well as the busiest airport in Pakistan.