This Ayotha Amirtha Gangai is a mythical river found in Akilattirattu Ammanai

Akilattirattu Ammanai

Akilathirattu Ammanai , also called Thiru Edu , is the main religious text of the Tamil belief system Ayyavazhi...

 the source of Ayyavazhi mythology

Ayyavazhi mythology

Ayyavazhi mythology is the mythology of the growing South Indian religious faith and a sect of Hinduism known as Ayyavazhi. The main source of Ayyavazhi mythology is the Ayyavazhi scripture, Akilattirattu Ammanai, and its supplement, Arul Nool. The Akilattirattu Ammanai is a recitation by Mayon to...

.It was located in Ayotha Amirtha Vanam the place where, Thirumal

Thirumal

Perumal also Thirumal is the Hindu deity most popular amongst Tamils of Tamil Nadu state in India and in the Tamil diaspora. Perumal is also another name of Lord Vishnu.-Early mention in Sangam literature:...

 through the instrumentality of the Seven Virgins give birth to the Santror Makkal. (see: Santror Pirappu). The land is surrounded by Sri Rangam in the North, Mount.Thirikonam in the south, Puttaapuram in the east and by Poonkavu in the west.