Agasthiyar Falls is located in Western Ghats to the South of Papanasam town and to the north of Papanasam Lower, the first lake in the descent of Tamiraparani River. It is located 42 km (26 mi) from the nearest city Tirunelveli. The waters from the falls meanders the stream in the river to Papansam hydro electric project and reaches the catchment area to the Papanasam Dam, which has a storage capacity of 142.15 ft (43.33 m).The place is frequented by animals like Tiger and Panther, which are frequently spotted in the route from Agasthiyar Falls to Papansam as both are located close to Kalakkad Mundanthurai Tiger Reserve.[5] The falls receives its waters during the South-west monsoon from May to September, but the maximum amount of rainfall is received during the North-east monsoon during October to December.But the falls is commonly said by the nearby locales as 365 days falls as people can go there any day because the water is from the dam hence the water flow will not be affected by the monsoon to a large extent. There is a small temple of Agasthiyar near the falls, where devotees worship after taking a holy dip in the falls. As per Hindu legend, during the divine wedding of Shiva and Parvathi, there was heavy crowd at Kailash, the abode of Shiva. Sage Agasthya could not view event and prayed to Shiva at this place to get him a view of the event. Pleased by his devotion, Shiva appeared to the sage and his wife Lopamundra along with Parvathi in his marriage attire. Shiva made the place his abode and came to be called Papansanathar and the falls nearby the temple got the name of Agasthiyar as Agasthiyar Falls. Tamiraparani River reaches is descent in flat land at this place. As per another legend, sage Urosamar floated a set of flowers in the river and the first flower reached the shore at this place. The sage established a temple for Papanasanathar and worshipped the deity here.As per another legend, the king of celestial deities, Indra slayed a demon Dwastha, the son of Sukracharya (the Guru of Asuras, the demons) as he was performing a penance to seek superior powers against the Devas. Indra incurred Brahmatti Dosha, a sin attained for slaying the Brahmin. He roamed around a lot of places for doing penance and finally on the advise of Brihaspathi, he landed at Papanasam. Since his sin (Papam locally) was expiated in this place, it came to be known as Papanasam.