1. Chengmai County: Located in the northwest of Hainan Island, it is a county surrounding the Beibu Gulf urban agglomeration and adjacent to Haikou, the provincial capital. It has been more than 2,000 years since the city was founded in the first year of Yuanfeng in the Western Han Dynasty (BC 1 10), and it is one of the three famous historical cities in Hainan in the Western Han Dynasty (namely, turtle shell, purple shell and borage).
2. Lingao County is a county directly under Hainan Province, located in the northwest of Hainan Island, bordering Chengmai County in the east, Danzhou City in the southwest, Beibu Gulf in the northwest and Qiongzhou Strait in the north.
3. Tunchang: a municipality directly under the Central Government of Hainan Province, located in the north-central part of Hainan Island, between east longitude10945'-1kloc-0/5' and north latitude 19 8 '- 19 37'.
4. Changjiang Li Autonomous County: Hainan Autonomous County, located between north latitude 18 53', east longitude 19 30' and east longitude 108 38'. Located in the west of Hainan Island, with a total area of 16 17 square kilometers, it governs 7 towns 1 townships, bordering Baisha Li Autonomous County in the east, Ledong Li Autonomous County in the south, and facing Dongfang City by Changhua River in the southwest.
Haikou: alias "Coconut City", the capital of Hainan Province, an international comprehensive transportation hub city, a national "Belt and Road" strategic fulcrum city and the core city of Hainan Free Trade Port, located at 19 3 1'~ 20 04' north latitude and1000 east longitude.