Sonprayag is the sangam of Vasuki and Mandakini rivers, but is not considered as part of the Panchprayags which are, in descending order, Vishnuprayag (Alaknanda and Dhauli Ganga), Nandaprayag (Alaknanda and Nandakini), Karnaprayag (Alaknanda and Pindar), Rudraprayag (Alaknanda and Mandakini) and Dev Prayag (Alaknanda and Bhagirathi).
Sonprayag is the sangam of Vasuki and Mandakini rivers, but is not considered as part of the Panchprayags which are, in descending order, Vishnuprayag (Alaknanda and Dhauli Ganga), Nandaprayag (Alaknanda and Nandakini), Karnaprayag (Alaknanda and Pindar), Rudraprayag (Alaknanda and Mandakini) and Dev Prayag (Alaknanda and Bhagirathi).