of the climate change was diminished. Troubling changes of the habitats were recorded, as a result of drastic reduction of the water quantity and overgrowth of algae which specifically affected the aquatic macroinvertebrate fauna. Rzav The Rzav continues as the natural extension of the Beli Rzav, but since the Black Rzav is longer, the latter is considered to be the main headstream. It flows between the southernmost part of the Zvijezda mountain (Ponos peak) from the north and the Suha Gora mountain from the south, next to the villages of Prosjek (and ruins of the medieval city of the same name), Dobrun and Žagre, before it empties into the Drina at the town of Višegrad. The Rzav drains an area of 605 km², belongs to the Black Sea drainage area and it is not navigable. References Sources Mala Prosvetina Enciklopedija, Third edition (1985); Prosveta; Jovan Đ. Marković (1990): Enciklopedijski geografski leksikon Jugoslavije; Svjetlost-Sarajevo; Rivers of Serbia Rivers of Bosnia and Herzegovina