... basins of more than 10,000 km2. Lowland areas are fed by two major river systems: the Red River in the North and Mekong River in the South.- In Vietnam, there are over 3,260 km of coastline ... result in high variation in climate, soil and topography, and thus, a wide variety of ecosystems, each of which has its own flora and fauna. Some main characteristics of Biodiversity in Vietnam ... adjusted to follow provincial boundaries, 30 natural and 9 artificial wetlands were documented. Vietnam has an exclusive marine economic zone of about 20 types of marine ecosystems. There are...