According to ancient beliefs, it is said that Lord Ganesha, in the form of a crow, used his divine power to release the water that was trapped in the Agathiyar kamandalam, a sacred water pot, causing it to overflow and form the River Cauvery.
The River Cauvery flows towards the Kallanai Dam, which was constructed by King Karigalan. At this point, the river splits into four branches known as Unara (Kolitam), Kaveri, Vennar, and Pudu River.
During the irrigation season, water is released from the dam into the Cauvery, Vennar, and Pudu rivers. In times of flooding, the excess water flows into the Kollidam River.
As the Kaveri River continues its course, it branches out into numerous smaller tributaries, providing irrigation to the entire delta region.
The agricultural activities in this region heavily rely on the water released for irrigation purposes.
People living here consider agriculture as part of life and culture rather than as a profession.
The delta districts, where the historic Thanjavur Temple and Navagraha Temples are situated.
In Tamil literature, the Kaveri River is often referred to as Ponni. This name has also been given to the rice grown in this region, known as Ponni rice.
After the harvest, the people of this land celebrate Pongal and offer their gratitude to the deities Kathiravan(Sun) and Kaviri Thaai(River Cauvery)
The cultivation of Ponni rice in this region holds immense historical significance and cultural importance.