The Sulm is a river in Southern Styria, Austria. It is 29.3 km (18.2 mi) long. Its drainage basin is 1,121 km2 (433 sq mi). Its two source rivers Schwarze and Weiße Sulm both originate at the eastern slopes of the Koralpe. It flows eastwards towards the Mur through the districts of Deutschlandsberg and Leibnitz. The Sulm valley runs from the Western Styrian hill ranges to the Eastern Styrian hills and lowlands.

The Mur or Mura is a river in Central Europe rising in the Hohe Tauern national park of the Central Eastern Alps in Austria with its source at 1,898 m (6,227 ft) above sea level. It is a tributary of the Drava and subsequently the Danube.