The Water Gardens of Sigiriya, part of the renowned historic and archaeological site in Sigiriya, Sri Lanka, exhibit the exemplary hydraulic engineering principles of ancient Ceylon. Located at the foothills of the Sigiriya Rock Fortress, these gardens are considered amongst the oldest landscaped gardens in the world. The layout of the Sigiriya Water Gardens is sophisticated, featuring a complex network of pools, fountains, conduits, and water pavilions that harmonize with the natural environment. The gardens would have been used for leisure by the monarchy, and their design reflects an advanced understanding of hydraulics, as the fountains are known to function solely by gravity and pressure, without the need for pumps. Excavations have uncovered the remains of limestone and marble floors, suggesting the gardens were luxuriously appointed in their day. Today, the remains of the gardens are a testament to the ingenuity of the ancient Sinhalese kingdoms and a pivotal part of the UNESCO World Heritage Site of Sigiriya Rock Fortress.