Radika River is a pearl among the rivers of Macedonia. Radika River has pure, clear and cool water with dark green colour, which is result of the calcium carbonate in it. Radika River rises on 2200 meters above sea level on the spectacular Bistra Mountain. From its source to the mouth of the river in Debar Lake, Radika River is 67 km long. The valley of Radika River is one of the most attractive and picturesque canyon valleys in Macedonia. The canyon has been formed over millions of years, breaking through the mountain sides of Bistra and Stogovo in the East and Korab and Deshat in the west.
The canyon on the Radika River is truly enchanting with the clear mountain water, surrounded by thick vegetation, as well as with the abundance of trout fish, which lures the fishing lovers. The scientists have researched over 30 caves, 10 meters long, in the upper part of the Radika River. Outstanding with its beauty is the 500 meters long "Simka" Cave.