Ranganatha can be spotted along with Venkatesa of Tirupati and Varadaraja of Kanchipuram. In South India, he is the most popular and wholeheartedly accepted aspect of Vishnu worshipped in this region.
It is to be noted that Srivaisnava cult largely worship this particular Lord at the shrine located in Srirangam in Tamilnadu. The image of this shrine is said to be born successfully out of the ocean. According to the Hindu religious scholars and pundits, the idol was given by Lord Rama to Vibhisana at this sacred spot. It was transferred to be carried by Vibhisana from Ayodhya to Lanka but he placed it at this spot for taking rest in the journey but it got fixed to the earth.
The idol of the Yogasayana type is represented as lying on the serpent bed in the yoga form with only two hands. It is to be highly noted that the left hand rests perfectly on the serpent bed and the right hand is apparently and comfortably supporting the head. He successfully killed demons named Madhu and Kaitabha. On the other hand sage like Markandeya and Bhrgu are depicted along with this Lord. The Lord is said to have the Ayudhapurusas (the weapons in human form) and the lotus with Brahma.
In Thiruvanantapuram of Kerala and in Srirangapatna of Karnataka, much similar Yogasayana images are largely found plus the Lord is known as Padmanabha or Anatasayana. The king among the bestowers of boons is known as Varadaraja, this lord is another aspect of Vishnu. he is also known as Karivarada.