Zellnitz an der Mur is a place, that before the Treaty of Saint-Germain belonged to Austro-Hungary and was situated in the administrative region Marburg/Maribor.
Zellnitz an der Mur was formerly part of the German Empire. In the German Empire, the place was called Weißenberg an der Mur. The place is now called Selnica ob Muri and belongs to Slovenia.