Waterfall Bigar is on the Stara Planina, 5 km from the village Kalna on the way to town Pirot. Water falls from the height of 35 m down the rocks called bigar, which was the inspiration for the name of the waterfall. It consists out of cascades of accumulated rocks and it has different levels.The waterfall is located at the altitude of 450 m on the place where the stream Bukovski meets the river Staljinska.