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Thenperambur Dam Over Vennar River in Tamilnadu Drone Video. Vennaaru is a tributary of the Kaveri River in southern India. It passes through Trichy and Thanjavur in the Tamil Nadu region of the country. The etymology of Vennaaru represents venmai (white) + aaru (river) in Tamil. The fertile landscape and lush fields in and around the village of Karandai are irrigated by this river. During the Chola period, a branch of this river was dug out and expanded by the Chola king Parantaka.thanjavur channel