Garuda, the celestial bird flew away with the Kumbh holding the nectar For 12 Divine Years During Conflict Between Devas and Danavas. Due to his Flight from one place to another, the drops of nectar fell at 12 places on earth During Each Year.
Note
The practice of organizing Kumbh Mela in Regular at First Four Places and at Rest 9 Places is Situational
Godavari river in Nashik (Maharastra),
Shipra river in Ujjain (Madhya Pradesh),
Ganges river in Haridwar(Uttarakhand),
Convergence of the Ganges, Yamuna, and Saraswati rivers in Allahabad/Prayag (Uttar Pradesh).
Kumbhkonam in Tamil Nadu,
Rameshwaram in Tamil Nadu,
Simariya Ghat in Begusarai district of Bihar,
Jagannath Puri in Orissa,
Gangasagar in Bengal,
Guwahati in Assam,
Dwarka in Gujarat and
Kuruskshetra in Haryana.
Final City - Vrindavan
At the End of His 12 Divine Year, Having Traveled Through Above 12 Places ,'Garuda' sat to take rest on Kadamb tree at Kali Dah in Vrindaban with the nectar pitcher whose drops fell here also
Note
The practice of organizing Kumbh Mela in Regular at First Four Places and at Rest 9 Places is Situational