Hainan Mangrove Wetland Conservation Park Hainan Mangrove Wetland Conservation Park is located in Chengmai County, Hainan Province. It covers an area of 2,200 mu and is located 573 kilometers from the west line of Haikou Huandao Expressway. It is only 30 minutes' drive from Haikou city center. Mangrove is a rare woody viviculture. It grows in the tidal shoals of the land and sea junction, is a special ecosystem of land to the sea. Mangrove community is the most wonderful and special biome on earth.