Historical distribution of this species included Cambodia, southern Laos, southeast Thailand, and western Vietnam. They are thought to be extinct in all areas outside of Cambodia. Kouprey live in low, partially forested hills, where they eat mainly grasses. Their preferred habitat is open forest and savannas often near thick monsoon forests. They are diurnal, eating in the open at night and under the forest cover during the day. They usually travel up to 15 km in a night.