The River-flat eucalypt forest or Coastal floodplain eucalypt forest is a critically endangered threatened ecological community that is primarily found in southeastern Australia, from southeastern Queensland, through New South Wales, to eastern Victoria, on alluvial soils of the coastal floodplains. The name chiefly refers to its riparian and floodplain landscape location and the predominant tree canopy being Eucalyptus, Angophora and/or Corymbia, which may exceed 40 m in height.