 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.The quality of ground water is poor compared to the northern shores of Tamil Nadu due to the presence of marine and semi-marine origin in sediments.The images from the satellite IRS 1A shows Thiruthuraipoondi was a coastal town (which is an inland in modern times) and the sea has regressed up to Vedaranyam in modern times.