Mangrove is a general term for a group of trees that grow in wetlands in tropical and subtropical estuaries and coastal tidal flats, and in wetlands that are flooded for a certain period of time by tides. Mangrove forests are composed of many plants. The mangrove forest in Sumiyo town is mainly composed of two types of tree, mehilgi and ohirgi.
In addition, the Mangrove forests in Sumiyou town is the second largest in Japan after Iriomote Island in Okinawa. There are many precious animals and plants here, including some that have become extinct in Okinawa.