Đavolja Varoš (Serbian Cyrillic: Ђавоља варош, meaning "Devil's Town") is a peculiar rock formation, located in south Serbia on the Radan Mountain near Kuršumlija. It features 202 exotic formations described as earth pyramids or "towers", as the locals refer to them. They are 2-15 m tall and 4-6 m wide at the base. These formations were created by strong erosion of the soil that was scene of intense volcanic activity millions of years ago.  Most of the towers have "caps" or "heads" of andesite, which protect them from further erosion.
Since 1959, Đavolja Varoš has been protected by the state and a 1995 decision of the Serbian Government declared it a major natural monument subject to category one protection.
A natural spring is located beneath the formations and has a high mineral concentration. There are two springs: Đavolja voda (Devil’s Water), with extremely acidic water (pH 1.5) and high mineral concentration (15 g/l of water), and Crveno vrelo (Red Well).