Helmstedt–Marienborn border crossing

The Helmstedt–Marienborn border crossing (German: Grenzübergang Helmstedt-Marienborn), named Grenzübergangsstelle Marienborn (GÜSt) (border crossing Marienborn) by the German Democratic Republic (GDR), was the largest and most important border crossing on the Inner German border during the division of Germany. Due to its geographical location, allowing for the shortest land route between West Germany and West Berlin, most transit traffic to and from West Berlin used the Helmstedt-Marienborn crossing.

Source: Wikipedia — Helmstedt–Marienborn border crossing (CC BY-SA 4.0)