This divyadesam of Lord Vishnu is situated in Tirukannapuram, a tiny village which is 35 Kms from the town of Mayiladuthurai in Nagapattinam district.
This is a Krishnaranya kshetram.
This temple is known as Bhooloka Vaikuntam as it is mentioned by Tirumangai Alwar and there is no traditional Swarga vasal here.
Pongal is the daily night offering to the Lord here. As per the legend, a chieftain used to partake food only after worshipping and offering same to the God . Once he lost all his wealth and as he did not pay taxes to the king he was arrested. Lord appeared to king in dream and asked to release his devotee. When he reached home his wife offered him Pongal. The chieftain known as Munayadharian worshipped God and offered the Pongal to Lord.
Next day the priest found some Pongal sticking to the mouth of the deity here. From that day Lord here is offered Pongal and the neivedhya is known as Munyadhariyan Pongal.
The Nithya Pushkarni in front of the temple is holy Tirtha and pitru poojas are conducted here on new moon day.
Moolavar here is known as Neelamegha Perumal and the Utsavar as Sowrirajan as He has long hair. There's an interesting story regarding this.You may check details here. Devotees can view this during procession on new moon days.
It is also said there is continuous vibration felt in the sanctum. You may find details in the same link I shared above.
