The Ranganathaswamy Temple is a Hindu temple dedicated to Lord Ranganatha, a form of Lord Vishnu, located in the city of Srirangam, in the Indian state of Tamil Nadu. The temple is considered one of the largest and most important in India and is one of the 108 Divya Desams, the holiest Vaishnava temples. The temple complex covers an area of around 156 acres and is surrounded by seven concentric walls, the outermost of which is over 2.5 kilometers long.

The temple is said to have been built in the 6th or 7th century AD, although the exact date is unknown. Over the centuries, the temple has been expanded and renovated by various rulers and has become a major pilgrimage site for Hindus. The temple is known for its rich history, elaborate architecture, and intricate carvings.

The main deity, Lord Ranganatha, is depicted reclining on a serpent bed and is considered one of the largest stone images in India. The temple also features several smaller shrines, each dedicated to different forms of Lord Vishnu, as well as a large number of halls and pavilions.

The temple is also famous for its festivals and celebrations, the most important of which is the annual Brahmostavam, a ten-day festival that takes place in the Tamil month of Vaikasi (May-June). During this festival, devotees from all over India flock to the temple to offer prayers and participate in various rituals and ceremonies.