 Vedaranyam has an average elevation of 1 m ( 3 @.@ 3 ft ) and is located on the Coramandel coast of Bay of Bengal . The Vedaranyam swamp is located parallel to the Palk Strait for 48 km ( 30 mi ) . The river Cauvery was flowing south easterly direction from Trichy and had its confluence at Vedaranyam due to the emergence of Vedaranyam nose ( the nose shaped stretch from Vedaranyam to Kodiyakarai ) during the pleistocene period . Due to the rise of teritiary rocks in the Pattukottai – Mannargudi region and also due to the increase of sediments in the Vedaranyam area , the river migrated northwards . There is lesser marine activity in the Vedaranyam shore due to the presence of Vedaranyam nose in the north and Sri Lanka in the south , both causing weak shore currents . 
