The correct answer is Sonprayag. Explanation & Key Takeaways: • Sonprayag is a place of religious significance located en route to Kedarnath Dham. • Sonprayag lies at the confluence of two holy rivers Basuki and Mandakini. Related Concepts: • The Panch Prayag of Uttarakhand traces the route carved by the Alaknanda River when it leaves its Himalayan abode from the Satopanth glacier. • First It is joined by the Dhauliganga River at Vishnuprayag, near Joshimath. • Nandaprayag is the second confluence in cascading sequence, where Alaknanda River is joined by Nandakini River. • The third confluence of the Alaknanda River is at Karnaprayag. Here, the Pindar River joins Alaknanda. • Rudraprayag is the fourth confluence between Alaknanda and the Mandakini River. • The fifth union takes place at Devprayag where the Alaknanda River joins Bhagirathi forming the river Ganges, which flows down to the plains. +-------------------------------+--------------+ | Rivers | Prayag | +-------------------------------+--------------+ | Alaknanda and Dhauliganga | Vishnuprayag | | Alaknanda and Nandakini River | Nandaprayag | | Alaknanda and Pindar | Karnaprayag | | Alaknanda and Mandakini | Rudraprayag | | Alaknanda and Bhagirathi | Devprayag | +-------------------------------+--------------+