Anatasaras

Tank gets fed primarily with rainwater collected from

1. ‘Giri Pragaram’ (precinct), 
2. ‘Anantha Alwar Pragaram’ and 
3. ‘Alwar Pragaram’ of the temple.

Apart from the rainwater, the tank had two wells named ‘Varaha Theertham’ and ‘Sarkarai Theertham’ and three natural springs near the Athi Varadar mandapam area. Stating that the tank had never dried up and that it held water even during the worst of the droughts faced by the State, the lawyers said the three natural springs were called in Tamil as ‘Vatradha Ootru.’ .The term ‘Anatasaras’ means a peaceful resting place and the deity is kept in ‘Egantha Kolam’ (resting posture) inside it for 40 years 

https://www.google.com/search?q=Anantha+Saras
https://www.google.com/search?q=nagabasams