The Lakatnik (Osikovo) Rocks are a set of beautiful escarpments, slopes, pyramids, pillars, caves and karst springs located on the left bank of the Iskar River between the rivers Opletnenska and Proboinitsa. The name of the rocks, and of the well-known train station lying below them, comes from the sharp bend of the Iskar River right there resembling an elbow (lakat in Bulgarian).