Kallanai, often referred to as the Grand Anicut, is a historic dam that was constructed in 150 CE by Karikala of the Chola dynasty. It is constructed (in running water) spanning the Kaveri River in Tamil Nadu, India, which runs from Tiruchirapalli District to Thanjavur District. The district of Thanjavur contains the dam. situated 45 kilometres from Tanjavur and 15 kilometres from Tiruchirapalli. The oldest in India that is still in use, it is the fourth-oldest water diversion or water-regulator structure in the entire globe. It is one of the most popular tourist destinations in Tamil Nadu due to its magnificent architecture.
