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.
Qiaozhong Road Tunnel The Qiaozhong Road Tunnel (海口侨中路通) is a tunnel in Haikou, Hainan Province, China. It connects Qiaozhong Road with Yusha Road, and is the only tunnel in the city.