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Ananthapura Lake Temple is a temple built in the middle of a lake in the little village of Ananthapura, Kasaragod District of Kerala, South India, at around 6 km from Kumble. 

Original seat (Moolasthanam) of Ananthapadmanabha Swami (Padmanabhaswamy temple) Thiruvananthapuram. 

An interesting spot to keep in mind while visiting the temple is a cave to the right corner of the lake.
https://www.google.com/search?q=Bilvamangala+Cave
 the deity Anantha Padmanabha chose to go all the way to Thiruvananthapuram through that cave. Hence both the places retain similar names, in spite of being on either end of the region.

https://en.wikipedia.org/wiki/Ananthapura_Lake_Templehttp://ananthapuratemple.com/
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