Mittel-Langenau is a place, that after the Treaty of Saint-Germain belonged to Czechoslovakia and was situated in the administrative region Vrchlabí.
Mittel-Langenau was formerly part of the German Empire. In the German Empire, the place was called Mittel Langenau. The place is now called -Prostřední Lánov (Lánov-) and belongs to Czech Republic.