The Grand Anicut, also known as the Kallanai was built by Karikala[18] and is considered one of the oldest water-diversion or water-regulator structures in the world which is still in use.[19] The Kallanai is a massive dam of unhewn stone, 329 metres (1,080 ft) long and 20 metres (60 ft) wide, across the main stream of the Kaveri.[20] A later Chola record from Tiruvaduturai refers to this event that is raising the banks of the Kaveri by Parakesari Karikala Chola.[1][2]