ISBN 81-7764-548-X. ↑ "This is the oldest stone water-diversion or water-regulator structure in the world" (PDF). Archived from the original (PDF) on 6 February 2007. Retrieved 27 May 2007. ↑ "Cauvery River – Britannica Online Encyclopedia". ↑ "Arulmigu Patteeswarar Swamy Temple - History".