The river Djetinja is a left tributary of the West Morava, it originates in the northern part of the Kremna valley, on the southwestern slopes of the Tara mountain of four smaller rivers.

Already on the third kilometer from the city center, the picturesque gorge of the river Djetinja begins, which is building an attractive canyon in its central part. The gorge of Djetinja has been declared a landscape of exceptional features and is marked as a natural asset of great importance. The whole area is characterized by a very dynamic morphology with numerous caves, sinkholes, scraping rocks… The gorge of Djetinja and in biological and biogeographical terms is an area with a number of ecological specifics. Its autochthony and richness are reflected in the presence of a large number of endemic, subendemic and relict plant species, and in terms of fauna, the fauna of diurnal butterflies stands out, which is one of the richest in Serbia – 17 species are on the tax list of the Red Book of Diurnal Butterflies of Serbia.