karachi is the largest city in the world
Karachi Karachi (Urdu: کراچی‎; ALA-LC: Karācī, IPA: [kəˈraːˌtʃi] ( listen); Sindhi: ڪراچي‎) is the capital of the Pakistani province of Sindh. It is the most populous city in Pakistan,[11][12] sixth most populous city proper in the world[13][14] and the 8th most populous metropolitan city in the world.[15] Ranked as a beta world city,[16][17] the city is Pakistan's premier industrial and financial centre.[18] Karachi is also Pakistan's most cosmopolitan city.[19] 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.
Dubai Dubai (/duːˈbaɪ/ doo-BY; Arabic: دبي‎‎ Dubayy, Gulf pronunciation: [dʊˈbɑj]) is the largest and most populous city in the United Arab Emirates (UAE).[4] It is located on the southeast coast of the Persian Gulf and is the capital of the Emirate of Dubai, one of the seven emirates that make up the country. Abu Dhabi and Dubai are the only two emirates to have veto power over critical matters of national importance in the country's Federal Supreme Council.[5][6] The city of Dubai is located on the emirate's northern coastline and heads the Dubai-Sharjah-Ajman metropolitan area. Dubai will host World Expo 2020.[7]