Are Xinmi and Haikou both cities ?
Haikou Hǎikǒu (), is the capital and most populous city of Hainan province, China. It is situated on the northern coast of Hainan, by the mouth of the Nandu River. The northern part of the city is the district of Haidian Island, which is separated from the main part of Haikou by the Haidian River, a branch of the Nandu.
Tianjin Tianjin (), formerly known in English as Tientsin, is a metropolis in northern coastal Mainland China and one of the five national central cities of the country, with a total population of 15,469,500, and is also the world's 6th-most populous city proper. It is governed as one of the four direct-controlled municipalities of the PRC and is thus under direct administration of the central government. Tianjin borders Hebei Province and Beijing Municipality, bounded to the east by the Bohai Gulf portion of the Yellow Sea. Part of the Bohai Economic Rim, it is the largest coastal city in northern China.