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.
G15 Shenyang–Haikou Expressway The Shenyang–Haikou Expressway (), commonly referred to as the "Shenhai Expressway" () is an expressway in the People's Republic of China that connects the cities of Shenyang, Liaoning, and Haikou, Hainan. When fully complete, it will be 3710 km in length.