The Bryansk Forest Nature Reserve, also known as Bryansky Les (Russian: Брянский лес), is a nature reserve in Bryansk Oblast, Russia, along the Nerussa River (a tributary of the Desna River) near the Russian border with Ukraine.

This climate is characterized by large swings in temperature, both diurnally and seasonally, with mild summers and cold, snowy winters.

The vegetation in the reserve features widespread pine and pine-oak forests on poor, sandy soils.

This includes the state nature reserve of federal importance "Kletnyanskoy", with an area of 39,100 hectares (97,000 acres).

[2] The animals in the reserve are typical of the southern range of the mixed boreal-forest subdomain of the Palaearctic region: grouse, boreal owl, hare, lynx, brown bear, and others.