Karlsau (Troppau-Karlsau) is a place, that before the Treaty of Saint-Germain belonged to Austro-Hungary and was situated in the administrative region Troppau.
Karlsau (Troppau-Karlsau) was formerly part of the German Empire. In the German Empire, the place was called Karlsau (Troppau-Karlsau). The place is now called NN and belongs to Czech Republic.