The
Thuringian Gate () near Sachsenburg, a district of
Oldisleben, west of
Heldrungen in central Germany, is where the gorge of the river
Unstrut breaks out of the
Thuringian Basin through the
Hainleite and Schmücke hills to the north. It is also known as the
Sachsenburg Gate.
This topographical feature carved out by the Unstrut has always been used as a communication route. Today the B 85 and B 86 federal roads and the Sangerhausen–Erfurt railway pass through the gorge. The Thuringian Gate was guarded in medieval times by the fortresses of Upper and Lower Sachsenburg.