The Zederhaus Valley is located in the northwestern part of the Salzburg Lungau region, on the southern slopes of the Lower Tauern mountain range, reaching up to Mt Weißeck at 2,711 m (8,894 ft).

From the Rieding high valley, today a protected area, the Zederhaus creek flows southeastwards, reaching the upper Mur River at neighbouring Sankt Michael.

The sparsely settled municipal area, the largest in the Tamsweg District, comprises the cadastral communities of Lamm, Rothenwand, Wald, and Zederhaus proper.

The valley today is characterised by the construction of the Tauern Autobahn in the 1970s, a major north-south road connection which is part of the European route E55.

The local peasants relied on seasonal mountain pasture farming, while today many inhabitants are commuter employees.