What was the name of the concrete fortifications, obstacles and weapon installations that France constructed on the French side of its borders with Switzerland, Germany and Luxembourg during the 1930s?

The Maginot Line, named after the French Minister of War André Maginot, was a line of concrete fortifications, obstacles and weapon installations that France constructed on the French side of its borders with Switzerland, Germany and Luxembourg during the 1930s. The line did not extend through to the English Channel because the French military did not want to offend Belgium given its policy of neutrality. The line was a response to France's experience in World War I and was constructed during the run-up to World War II, shortly after the Locarno Conference that gave rise to a fanciful and optimistic "Locarno spirit".

The French established the fortification to give their army time to mobilize in the event of attack, and allow French forces to move into Belgium for a decisive confrontation with Germany.