Barraux (French pronunciation: [baʁo]) is a commune in the Isère department in southeastern France.

The general layout invented by the Piedmontese architect Ercole Negro was left almost intact by its followers: A fortress with an extended star shape with a narrow end, including many bastions and ditches.

A few enhancements were undertaken by the engineers of King Henry IV but didn't affect its general layout.

Vauban, Fortress Inspector in Chief of King Louis XIV in the late 17th century didn't change the arrangement of bastions and curtains.

He instead improved the various buildings inside the fort: two barracks, the well, the chapel, the large powder magazine and the gate house; as well as expanding the fortifications internally and externally.