"Sarvamangala Mangalye
Sive Sarvardha Sadhike
Saranye Trayambake Gauri
Narayani Namosthuthe"It is believed that Adi Shankaracharya had a vision of Sri Mookambika Devi and installed the deity here. The legend goes that Adi Shankara mediated at Kodachadri hills and Devi incarnated before him asking for his wish. He revealed his wish to install the Devi idol in a place in Kerala to worship where he wanted. Devi agreed but put forward a challenge that she will follow Shankara and he should not look back till he reaches his destination. But to test Shankara, Devi deliberately stopped the voice of her anklets when they reached Kollur whereupon Shankara turned and looked back because of doubt. Devi then asked Shankara to install her vigraha, just as he sees her, at that very location in Kollur.
The two rivers Agnithirtha & Sowparnika which flow in the sanctuary of mookambika descend from Kodachadri hills. The wee spring of cool water situated in between the temples of Kalabhairava and Umamaheshwara is the source of river Sowparnika. Legend says that Suparna (Garuda) did a penance on the banks of this river praying to the Goddess for the abatement of his mother Vinutha's sorrows. When the Goddess appeared before him, he prayed that the river be henceforth known after him, Suparna, and therefore came to be called as Sowparnika. At the location where he is said to have sat in penance, there is a small cave even today which is known as "Garuda's Cave".
Mantapa, Kodachadri Hills
This holy river takes birth at the Kodachadri and flows up to the edge of Anthargami (now oluru) region where two more streams called Bhrungisha and Pippalada join it. Then it flows westward, surrounding Kollur in the name of "Sampara", and proceeds to join the sea near the temple of "Maharajaswamy" (Varahaswamy) at Maravanthe. It is believed that river absorbs the elements of 64 different medicinal plants and roots as it flows, therefore it cures all the diseases of those who bathe in it. Hence a bath in this river assumes significance and is considered sacred.