The Savinja (pronounced [saˈviːnja]) is a river in northeast Slovenia which flows mostly in the Upper and Lower Savinja Valley (Slovene: Zgornja in Spodnja Savinjska dolina) and through the cities of Celje and Laško. The Savinja is the main river of the Savinja Alps (Sln. Savinjske Alpe). It flows into Sava River at the town of Zidani Most.