Dense semi-evergreen forest, upland savannah, bamboo thickets and occasional patches of mixed deciduous forests are the majority of the vegetation of Virachey National Park. Hills and Mountains dominate the topography of the area, with most areas lying higher than 400m above sea level and elevations reaching over 1500m above sea level align the border with Lao P.D.R. Grasslands and scrubland formations are found in isolated areas as well as marshes.
The Fauna in Virachey National park covers mammals, birds, reptiles and fish. A significant number of threatened and endangered species occur in VNP, especially cats, bovid, small carnivores and primates are threatened. However its not very likely to see some wildlife during a 3-day trek as animals are very shy and the number of mammals is very small compared with the size of the park. Other animal species as birds are easy to spot and to observe.
Threatened and endangered Species:
Of particular concern are key species as:
Camera Trap programs of the last years have brought evidence for the existence of several species as: