There are in total eight Svayam Vyakta Ksetras ("self-manifested shrines"), of Lord Vishnu, according to Sri Vaisnava philosophy namely, Srirangam, Srimushnam, Venkatadri, Saligramam, Naimisaranyam, Totadri, Pushakara and Badrinath. Of these, Srirangam is the first and of foremost importance.

Srirangam, the premier Vaishnava temple in South India is the first and foremost among the 108 Vaishnava divyadesas. All the Alvars have sung in praise of the deity enshrined in the huge temple in the center of the town. The Sri Vaishnava Acharyas from Nathamuni are found to have taken an active and abiding interest in the management of the temple.

thanks for the nice darshan of SHRIRANGAM - a swayam vyakta kshetras of shri narayana...You know today is thrusday... a day of worship of lord Vishnu and we worship Him every thrusday worship trunk of banana tree and observing fast on the name of Vishnu.

http://aslikhabar.blogspot.in/2010/12/shrirangam-swayam-vyakta-kshetras-of.html