Jablonec nad Jizerou is a place, that after the Treaty of Saint-Germain belonged to Czechoslovakia and was situated in the administrative region Jilemnice.
Jablonec nad Jizerou was formerly part of the German Empire. In the German Empire, the place was called Jablonec an der Iser. The place is now called Jablonec nad Jizerou and belongs to Czech Republic.