Sanct Marein bei Erlachstein is a place, that before the Treaty of Saint-Germain belonged to Austro-Hungary and was situated in the administrative region Cilli/Celje.
Sanct Marein bei Erlachstein was formerly part of the German Empire. In the German Empire, the place was called Erlachstein. The place is now called Šmarje pri Jelšah and belongs to Slovenia.