... 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 ... more than 11,000 species including 2,500 marine fish, 225 shrimp, over 200 phytoplanton, nearly 700 zooplankton 100 mangrove plant, 15 sea grass and over 6,000 benthic inverterbrate species....