The Savinja is a river in northeast Slovenia which flows mostly in the Upper and Lower Savinja Valley and through the cities of Celje and Laško. The Savinja is the main river of the Savinja Alps. It flows into the Sava River at the town of Zidani Most. It has often flooded, such as in the 1960s, 1990, and 1995. The Savinja has a length of 101.75 kilometres (63.22 mi) and a catchment area of 1,847.7 km2 (713.4 sq mi).