Magnot line:

1. The line dividing Austria and Germany
2. Straight-line which divides tangent
3. Defense barrier between France and Germany during IInd World War
4. The border between Germany and Switzerland during Nazi Germany                                                                                                                                                                          

The Maginot Line is a line of concrete fortifications, obstacles, and weapon installations built by France in the 1930s to deter invasion by Germany and force them to move around the fortifications.