Bolska

The Bolska is a river in Slovenia that flows for 32 km before joining the Savinja as its largest and longest right tributary. Its watershed covers 190.3 square kilometres of transitional territory in central Slovenia, stretching from the Sava Hills to the Menina and Dobrovlje karst plateaus and extending to the southwestern edge of the Celje Basin. The river rises northwest of Trojane at an elevation of about 815 metres and descends to its confluence with the Savinja near Prebold at 264 metres. The Bolska and its numerous torrential tributaries are characterised by a pluvial regime with seasonal flooding, making the watershed particularly prone to catastrophic flood events, as demonstrated by the devastating storm of June 1994.