The Three Pools Fountain, also known as the monumental Nymphaeum, is located at the entrance to ancient Side, next to the main gate of the ancient city. It is situated in the northern part of the archaeological zone, not far from the modern center of Side, and is usually one of the first ancient structures visitors see on their way to the main monuments.

The structure dates back to the Roman period and is generally dated to the 2nd century AD. It was a ceremonial city fountain connected to the water supply system: water arrived here via the aqueduct and was then distributed to different parts of the city. In Roman Side, such structures had two functions at once - practical and public, since they served as an important element of the city's infrastructure while also framing the entrance to the city.

Originally, the Nymphaeum was a large multi-tiered structure with a wide facade. It was decorated with columns, niches, statues, and marble cladding, while the pools and water cascades emphasized the status of this place. Today, ruins remain, but they still allow visitors to imagine the monument's original scale and see the characteristic features of Roman architecture.

For tourists, the fountain is interesting not only as a striking architectural object, but also as part of the engineering system of the ancient city. It is convenient to explore at the beginning of a walk through the archaeological area of Side, combining the visit with the city walls, the ancient street, the gate, and other nearby ruins.