Located in the southeast of Indochinese Peninsula Vietnam has 4,639 kilometer-long boundary on land and a coastline of 3,260 kilometers long. Lower from the northwest to the southeast, Vietnam has the diverse topography with mountains, hills, plains, coasts and continental shelf. The typical topography in the North is mountainous, while the Central Vietnam has the largest difference in height between the east and the west, and quite simple topography with Mekong Delta in Southern Vietnam. Thus the Vietnam's climate also changes and different from the north to the south which has two main climate regions, the tropical monsoon climate with four seasons in the North and the typical tropical climate with two separate seasons in the South.