Viet Nam has more than 3,500 krn in length and about 3,000 islands and 2 archipenlagoes as Hoang Sa and Truong Sa. The coastal and island landforms are very diversified on genesis, morphology, spatial scales and their materials. The coastal and island landforms have used and using in both indirection as infrastructures (including settlements, urban and industrial areas, resorts and jumping-off place to the open sea), and direction as tourism and nature conservation for development of marine economics.