Great Bulgarian Forest

43°30′N 22°12′E / 43.5°N 22.2°E / 43.5; 22.2

Great Bulgarian Forest (latin: Silva Magna Bulgarica or Silvas Bulgarorum; Bulgarian: Българска гора, Великата българска гора, Български лес, romanized: Bŭlgarska gora, Velikata bŭlgarska gora, Bŭlgarski les; Serbian: Бугарска гора, romanized: Bulgarska gora) is the historical name for the territory between Belgrade and the Gate of Trajan, entering Via Militaris in Thrace, a stretch of about 400 km (250 mi).

Usually the name Bulgarian Forest referred to the mountain hills overgrown with dense forests along the Great Morava and Nisava, including the massifs of mountain ranges in today's central parts of Eastern Serbia and Western Bulgaria. In the narrower geographical sense, the territory covers the forested mountain ranges of the Timok Valley (according to the Romanian understanding of the area), located east of the Great Morava River.