Dujiangyan is a unique 'living' ecological masterpiece. Unlike contemporary systems in Egypt or Mesopotamia that relied on massive dams, Dujiangyan employs a 'dam-less' irrigation strategy. By utilizing the Yuzui (Fish Mouth) jetty, Feishayan spillway, and Baopingkou (Bottle-Neck Channel), it achieves an automated water and sediment regulation system. Conceived in 256 BC, it continues to nourish over 10,000 square kilometers of the Chengdu Plain, with its irrigated area expanding consistently for over two millennia. Key Comparison: While Roman aqueducts were primarily engineered for transporting drinking water, Dujiangyan operates on a philosophy of 'working with nature.' It transformed the fierce Min River into a permanent engine of agricultural productivity, outlasting the design lifespan of almost any modern dam.