Question

At which place the chambal, betwa, son join ganga and how they ultimately join.

Answer 1

The rivers Chambal and Betwa first meet a major river Yamuna at Etawah. Yamuna then meets the holy river Ganga at Allahabad.

The river Son finally joins Ganga at Patna. Allahabad is considered a holy place by Hindus as it is the meeting point of Ganga and Yamuna.

Answer 2

Heya mate....  Chambal and Betwa join Yamuna at the Etawah district and Hamirpur town in Uttarpradesh. As we move to the East, Yamuna Joins Ganga at Triveni Sangam, Allahabad.Son River joins River Ganga near Patna, Bihar.  @skb