Dongzhaigang Mangrove Nature Reserve in Haikou, Hainan Province is the first largest mangrove nature reserve in China. Mangroves are distributed on the whole coastal shoal, where mangrove plants grow all year round in the sea. You can rowboat into the mangrove. We choose the coastal trestle. In the afternoon, some roots of the trees come out of the water. There are many colorful crabs crawling around happily. The scenic spot is still very primitive, and there are not many tourists.