The ecoregion supports a number of rare species due to the relative isolation, the diversity of habitat, with mixed forests of deciduous Mongolian oak and conifers of Korean pine.

Because mountains rise above the region on three sides, with plains and wetlands below, the area supports high biodiversity as a transition zone.

On the eastern side, the most common conifers are Korean pine (Pinus koraiensis), Manchurian fir (Abies holophylla), and Siberian spruce (Picea obovata).

On the western side, common conifers include Scots pine (Pinus sylvestris).

[2] The forests are home to wildlife such as the Ussuri brown bear (Ursus arctos lasiotus), Ussuri black bear (Ursus thibetanus ussuricus), Manchurian wapiti (Cervus canadensis xanthopygus), Manchurian sika deer (Cervus nippon mantchuricus), common raccoon dog (Nyctereutes procyonoides), wolves (Canis lupus), red foxes (Vulpes vulpes), and wild boar (Sus scrofa).