Tiruvadanai or Thiruvadanai is a town and a taluk headquarters of the Ramanathapuram district, in Tamil Nadu, India. The town is known for the Adhi Ratneswarar Temple and is mentioned in the Thevaram hymns. It is situated about 70 km away from Ramanathapuram and can be reached from Karaikudi via Devakottai or Madurai via Sivagangai."Unbelievable Temple ".