This project is co-financed by the European Union through
It is formed from the merger at Demyanitsa hut of Valyavitsa, Gazeiska voda and Vasilyashka rivers. Springs from the large Demianshki circus, which includes 49 lakes. It flows north towards Bansko town. At its upper part is a typical avalanche valley with a tray shape. The river valley is formed in granites, and in the lower streams - in marbles. There is snow, rain and lake supply. It is 13.5 km long.