Varanasi to Kumbakonam

Nine sacred rivers of India,

1. Ganges, 
2. Yamuna, 
3. Saraswati, https://freeglobaluniversity.blogspot.com/search/label/IlahabadAllahabadPrayag
4. Narmada, http://jyo0.blogspot.com/search/label/BanaNarmadaLinga
5. Cauvery, https://freeglobaluniversity.blogspot.com/search/label/Agastya
6. Godavari, http://8sea.blogspot.com/
7. Krishna, http://trinitygods.blogspot.com/search/label/River
8. Tungabhadra https://freeglobaluniversity.blogspot.com/search/label/Stun
9. Sarayu https://freeglobaluniversity.blogspot.com/search/label/RAM

Prayed to Shiva at Banares (Viswanathar) to be absolved of the sins washed away by bathers,

http://banarasvaranasikashi.blogspot.com/

and were directed to bathe in the Mahamagam tank  Viswanathar of Kaasi manifested himself here at Kumbhakonam at Kudandaikkaronam

http://01kk.blogspot.com/

Both Temples
https://en.wikipedia.org/wiki/Kashi_Vishwanath_Temple_(disambiguation)