It lies at the confluence of the rivers Kaveri, the largest river in Tamil Nadu and Bhavani, the second largest river in Tamil Nadu, with Akash Ganga. Hence this place is known as the Triveni Sangamam of South.
The Sangameswarar Temple built at the confluence of these rivers, is a pilgrimage and tourism spot. This Siva Temple at Bhavani near Erode, in Kongu Naadu, is a shrine at the confluence of Bhavani, Cauveri and Amrutavahini rivers(Mukkoodal). The temple is located on the northern bank where the rivers meet. The name Thirunana that is "Themai nannaa oor, literally means, no evil will befall in this city. Hence it is believed that no evil will befall those who visit this Temple.
According to Hindu legends, Kubera, son of Visirava (Visrava) was gifted with an aircraft in recognition of his devotion to Lord Shiva. While visiting all the Shiva temples at various places in the country, he saw an Ilandhai Jujube tree on the banks of the Cauvery river where the deer, tiger, cow, elephant, snake and the rat were drinking water without any sign of enmity among them. It was a place inhabited by holy men, gandharvas and such good people. Kubera heard a voice from the sky saying that the Vedas came to the earth at this place near the Ilandhai tree and that there was a Shivalinga beneath it and advised him to worship the Lord and reap the benefits. The Lord "Shiva" thereafter appeared before Kubera. At his request, the Lord also is named Alagesan.
This is the place where rivers Cauvery, Bhavani and Amirtha (invisible) meet. People perform rites here to satisfy their departed elders.The other speciality in Bhavani is that when dead bodies are burnt, the skulls do not scatter as generally found in graveyards at other places. It is said that that this is because there are 1008 Sivalingas under the earth.
For cure from high fever, people offer rice prepared with pepper and jeeragam to the Lord and get cured. Besides these prayer offerings, people also come here for removal of obstacles to marriage etc.
There are heavy crowds here during new moon days and the 18th day of the Adi Tamil month (July-August). Devotees offer pujas to Mother Cauvery with coconut, fruits, flowers, earrings made of palm leaves, black pearls etc. It is a scene of great delight. Also, those who bathe in the confluence spot of Cauvery and Bhavani rivers during the Solar and Lunar Eclipse are said to attain salvation. They offer fine clothing to the Lord and the Goddess.
It is also believed that performing pujas and offering donation for righteous causes ensure the devotee with manifold benefits.The Ilandhai tree in the temple yields sweet fruits offered to the Lord each day during puja times. Women seeking boon for begetting a child, consume the fruits and become fertile.
The Amirthalingeswarar in the temple is placed on a seat called Avudayar according to Saiva principles. It is a mobile one that can be removed and placed on the seat again. Men and women seeking boons for children take the Sivalinga, perform puja and walk around it for three times and place it back on the Avudayar. The Amirthalinga is in the southern entrance of the temple. The other names of the Lord here are Alagesan, Sangamanathar, Maruthulingam, Vakreswara, Nattatriwara and Thirunannavudayar.
The Goddess Vedanayaki is also known as Sangameswari, Bhavani Amman, Maruthunayaki and Vakreswari. It is said that the four Vedas came into being on this soil. The holy waters of Bhavani are known as Cauvery theertham, Bhavani & Amirtha River, Surya theertham and Gayatri theertham. The temple is situated at the confluence spot of the Cauvery and Bhavani rivers, known as Kooduthurai. Of the seven holy Shiva centers of the Kongu Region, Bhavani is one. The scriptural name is Thirunana.