Panchathirtha is a lake in Tholpetty, south of the Thirunelly temple. ‘Pancha’ means five and ‘thirtha’ refers to the ‘rivers’ flowing at this place. This lake encompasses five thirthas, namely Sankha, Chakra, Padma, Gatha and Sreepada. It is believed that these thirthas meet at this point; hence, it has been named Panchathirtha.
There is a rock near the site that has imprints of Sreepada, an incarnation of Lord Vishnu. It is believed that Sreepada stood on the rock for giving instructions to Lord Brahma. The ideal time to visit this lake is during the winter season, as the lake dries up during the summer months.