One such Triveni Sangam, in Allahabad, has the confluence of two rivers -- the Ganges and the Yamuna (and the imaginary Saraswati River). The two rivers maintain their visible identity and can be identified by their different colours. The water of the Ganges is clear, while that of the Yamuna is greenish in colour.
which city is situated at the confluence of the yamuna and ganga
Allahabad