The capital of Hainan Province is the political, cultural, economic and transportation center of Hainan Province, as well as the hub of sea, land and air transportation.It is located in the west of the Nandu River Estuary, the largest river in Hainan Island, and is the estuary of the Nandu River, so it is named Haikou.The total area is 218 square kilometers, and the urban area is 25 square kilometers.The population is more than 400000.It governs 2 towns and 6 townships.Zhendong District, Xinhua District and Xiuying District are set in the urban area.The terrain is high in the south and low in the north. It inclines from southwest to northeast. It is a plain platform zone with undulating terrain.The northern part of the urban area is mostly a first-class platform, which is a proluvial and impact marine erosion terrace and a high floodplain terrace of the Nandu River. The terrain is low-lying and flat, with an average elevation of about 4m.In the south of the urban area, there are mostly three or four level terraces, which are plain and hilly. There are no high mountains in the area,
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