Sri Oondreeswarar temple is located in the village named Poondi, in the district of Thiruvallur, in the state of Tamil Nadu in South India. The main deity of this temple is Oondreeswarar (Lord Shiva) and his consort is Minnoli Amman. The festival deity is Somaskandar.
The holy tree of this temple is Ilandhai. The holy waters of this temple are Kuchasthalai River and Kayilaya theertham. The agamam or pooja of this temple is known as Kameeyam. This temple is nearly 1000-2000 years old in this region. The historical names of this place are Pazhampathi and Tiruvenpakkam.
According to the local legends and scholars, “The temple is praised in the Thevaram hymns of Saint Sundarar. in a hymn, Sundarar appeals to Lord Shiva for a remedy to his impaired vision and feels sure that the Lord had assured him His grace and asked to proceed.”
The most important festivals of this particular shrine are Aipasi Annabishekam in October- November, Masi Mahashivrathri in February-March, Tirukarthikai in November-December, Deepvalli, Pongal, Vaikunta Ekadashi, Amavasya, Pournima and Lord Shiva related festivals are celebrated in this temple with great devotion and dedication.
It is to be noted that as Swaymabu Linga, Lord is facing towards the east. According to the local legends, Lord gave a walking stick (Oondrukol) to a noted saint named Sundarar, therefore the Lord is praised largely as Oondreeswarar. This temple is popular for following the tradition of offering Vada mala to the deity. The Nandi is found broken in this ancient temple.