Avinashi Eswarar Temple is the 1st of the 7 Tevara Stalams in the Kongu Region of Tamilnadu. The word Avinashi means that which is indestructible. This better known as Karunaiyaaththaal temple. Avinashi is also referred to in inscriptions as Dakshina Varanasi.

History: Inscriptions reveal that the Cholas, Pandyas and the Hoysalas made extensive endowments to the temples. Sundaramoorthy Nayanar on his way to Tiruvanchikulam is said to have miraculously rescued a boy from the clutches of a crocodile here and this event is commemorated during the `Mudalai Vaai Pillai` Utsavam on Panguni Uththiram. There is a shrine to Sundarar on the shore of the Tamaraikkulam.

Temple: The Ambal shrine is next to Avinasiappar`s sanctum. The Kasi Gangai Theertham is in the form of a well. The Kaalabhairavar shrine here is held in great reverence. Kaala Bhairavar is worshipped here with offerings of Vadai Maalai.

Architecture: This temple has two prakarams. The Navaranga Mandapam is in the inner prakaram. The mandapam in front of the Ambal sanctum has beautiful sculptures. The large nandi and the carved image of a scorpion can be seen in the Ambal sanctum. There are several carvings here.

Festivals: The annual Bhrammotsavam is celebrated in the month of Chittirai.