The state's water resources include seasonal rivers, scenic mountain lakes, and an extensive coastline along the Bay of Bengal.
* **Rivers:** The Kaveri (Cauvery) is the longest and most culturally significant river in the state. Other major rivers include the Vaigai, Thamirabarani, and Palar. * **Lakes & Wetlands:** Pulicat Lake is the second-largest brackish water lagoon in India. Point Calimere and Vedanthangal are crucial wetland sanctuaries for migratory birds. * **Waterfalls:** Hogenakkal Falls on the Kaveri river is often called the "Niagara of India." Other notable falls include Courtallam (Kutralam) and Agaya Gangai. * **Beaches:** Marina Beach in Chennai is the longest natural urban beach in India.