 The Vedaranyam swamp is located parallel to the Palk Strait for .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.