Papuk is the largest mountain in the Slavonia region in eastern Croatia, near the city of Požega.

It extends between Bilogora to the northwest, Krndija to the east, and Ravna gora and Psunj to the southwest.

One is that it comes by assimilation from earlier "Bapuk", where "Ba" is the name of the Celtic tribe that inhabited the region, and "Puk" comes from the Indo-European root *peiH, meaning "big".

From the main mountain-ridge well intended are two spurs and a tract watered by a drainage basin in the direction north south.

As a remarkable point, emphasis lies on peaks Točak (887 m), Papuk (953 m), Ivačka glava (913 m), Češljakovački vis (820 m), and Kapovac (792 m), which are spread out continuously, and act as a drainage divide between the numerous tributary streams flowing to the river Drava to the north, and the river Sava to the south.

In its western part Papuk mountain range is about 20 km wide, formed by three parallel ridges: Lisina (Crni vrh 863 m), Ljutoč (716 m) and Ravna Gora.