Kozarnika (Bulgarian: Козарника) is a cave in the western Balkan Mountains of Bulgaria. It is located near the village of Lipnitsa, Botevgrad municipality, 600 m from Preslavica neighbourhood. In Bulgarian Kozarnika means "goat pen" and the cave was given this name by local people, who had hidden there their goats in the past.[1]
The cave's entrance is 4.5 m wide and 2.5 m high. Its total length is 89 m.[2] The cave has no waterways, it is easily passable and contains with a single winding gallery with one branch that stems from the main gallery. The first 15 m of the gallery are high and wide but then it gets narrower and lower. There is a 14-meter high chimney.[1]