The ecoregion covers a Z-shaped area in which the northern section is a 400 km band of forest north of Khabarovsk parallel to the Amur River (which is 20–30 km to the south), the vertical band of which parallels the Ussuri River (which is 20–30 km to the west) on the western slopes of the Sikhote-Alin Mountains, and the base of which is the eastern slope of the Sikhote-Alin in Primorsky Krai.[1][2]
The region has a Humid continental, cool summer climate (Koppen classification (Dwb)). This climate is characterized by high variation in temperature, both daily and seasonally; with dry winters and cool summers.[3]
The Ussuri forests are the most biologically diverse in northern Asia.[2] The maritime influence moderates the climate, precipitation is high enough to support rich forests, and the region is a boundary area between mountains, river flat lands, and sea coast.[5][6]
Ussurisky Nature Reserve, one of the remaining virgin mixed deciduous-conifer forests in the Primorsky (Maritime) region of the Russian Far East. Located on the western slopes of the Sikhote-Alin mountains. (404 km2)
These are all IUCN class Ia "strict ecological reserves" (zapovedniks).
