Arulmigu Prasanna Venkatachalapathi temple lies at the top of Perumalmalai that lies 960 feet above ground level in pachaimalai hills, 3 km from Thuraiyur in Tiruchirappalli district. This temple is said to be constructed by the grand son of Karikal Chozhan. The kings are later named as Karuppannar and Veeraswamy and are worshipped in the temple .Musical pillars are seen here. The stone sculptures of ten avathars of Lord Vishnu are here. The Goddess here is named as Alamelumangai Thayar..All the Saturdays of Tamil month of 'puratasi' (September-October ) are celebrated in a grand manner, during which time more number of pilgrims are visiting this temple .Hundreds of devotees are taking part in the Girivalam procession around the Perumalmalai hillock on all full-moon days.