File:11th century Cheranmadevi Bhaktavatchala Vishnu temple architecture, Tirunelveli Tamil Nadu.jpg

English: The temple is known by several names: Cheranmahadevi, Cheranmadevi, Seramadevi Chaturvedi Mangalam, Bhaktavatchala, Bhaktavatsala and in inscriptions as Ramaswami temple. It is a Vishnu temple built during the reign of Rajendra Chola I (1012-1044 CE) according to its inscriptions, expanded significantly in the 12th-century. It is one of the 108 divya desams and an active house of Hindu worship.

The temple is located in the village Cheranmadevi or Cheranmahadevi, midst paddy fields, close to the right bank of river Tamraparni, west of Tirunelveli city. The river has numerous other historic Vishnu, Shiva and Devi Hindu temples all along it.

The temple complex includes several shrines, including those for Vishnu, his avatars such as Bala Krishna as well one for Bhudevi. The ten incarnations are depicted in the temple artwork, along with secular scenes and devotees. Of particular interest are the reliefs for Yoga Narasimha and intricately carved images of dressed up women devotees. The pillars and pilasters are finely carved. The temple vimana and superstructure feature Hindu gods and goddesses from various traditions, of which Vishnu avatar are most prominent and common. The main shrine has Garbhagriha, ardha mandapa, maha mandapa and an exterior circumambulation mandapa (somewhat damaged). The smaller shrine dedicated to Krishna has a mandapa and sanctum as well. The main shrine includes a Garuda monument facing the sanctum.

The temple walls have numerous inscriptions, almost all from the late Chola and Pandya era. The site is a protected monument under the control of Archaeological Survey of India.