108 places sacred to Vishnu, where the 12 Alwars sung their Nalayira Divya Prabandham, 4,000 verses in honor of Vishnu.
All about Divya Desham
https://trsiyengar.com/srivaishnava-108-divyadesam
The counterpart of Shiva tradition are the 276 Padal Petra Sthalam