korea is located between 33 ° and 43 ° n, the eastern end of the eurasian continent. it is rich in precipitation and has various seasonal climate characteristics. in korea, there are large proportion of areas occupied by mountains, and mainly mountains are distributed in the north and east part of the nation. large and gentle rivers flow along west and south, and there are various erosion and sediment terrains along the rivers. on the southern coast, there are many islands and complex coastlines, and a wide tideline appears on the west coast. dunes and lagoons are developed along the monotonous coastline on the east coast.