Kalamas river springs from Epirotic mountains of Ioannina. It passes through Ioannina and Thesprotia prefectures falling to the Ionian sea.
The river, the vegetation and the scenery of the river banks create pictures of unique natural beauty. The gorge, the narrows, "Anavristika" spring location, Kalamas delta and the water biotope, the damp area and Kalamas river tributaries create some of the most beautiful river sceneries. In Pente Ekklisies, Polidroso and Malouni villages the river goes through the rocks creating 1 km long imposing gorge. The gorge or Kalamas Narrows also has a riparian forest, bushes and drop with scantly vegetation. In this area live large birds of prey, rare bird and flower species.
Between Sagiada, Regio and Igoumenitsa you can see Kalamas delta which is one of the most important water biotopes in Greece. The delta is rich in flora and fauna and you can see hills with dense bushes and a forest where many animal and bird species live. The river beds are full of plane trees which are gradually replaced by tamarisk. The wild horse herds that run around the area are a nice surprise that offers the delta. In the Dam, in Ragio area, the river spreads with many distributaries forming a riverside forest with plane trees, poplar trees and weeping willows. Kalamas Narrows and delta have been proposed to be included in the European ecology network Natura 2000.