Another significant feature of the complex is the set of watermills located below the Gargar Bridge. These mills, driven by the force of falling water, were used to grind grain and process agricultural products, turning hydraulic energy into mechanical power. The sound of the rushing water and the movement of millstones once formed a vital part of the daily rhythm of Shushtar’s economic life. The design of the mills reveals a highly efficient use of kinetic energy, showing that the engineers understood how to convert natural flow into sustained, practical energy long before the modern industrial age.
