Kuttam Pokuna

Kuttam Pokuna (twin ponds or pools) are well preserved old bathing tanks or ponds in Sri Lanka. This pair of ponds was built by the Sinhalese in the ancient Anuradhapura Kingdom. They form part of the Abhayagiri vihāra complex and are an example of the works in the field of hydrological engineering, architecture and art of the ancient Sinhalese.

Water was transported from a rainwater reservoir over a distance for 3 km  to the ponds through underground ducts. Before the water entered the northern pond via the stone spout in the northern wall, it passed through the filter system. Through the underground duct the water passed from the north pond to the south pond. Eventually the water was drained from both ponds through a drain on the bottom of the small pond, to be used to water nearby rice fields