Biržai Forest
56°18′N 24°55′E / 56.300°N 24.917°E
The Biržai Forest is a old-growth forest in Biržai District Municipality, Lithuania. The forest is recognised as a Key Biodiversity Area of international significance, with about 99.96% of its area under protection. It is managed, with some other smaller forests, by the Biržai Forestry Authority (Biržų miškų urėdija).