Priyanka Gandhi embarked on a 140 km long 'Ganga yatra' from Prayagraj to Varanasi. The Congress's general secretary in charge of eastern Uttar Pradesh is on a 3-day river journey on a steamer boat from March 18-22. The river journey marks the launch her party's poll campaign. She also offered prayers at Bade Hanuman temple in Prayagraj. The river journey will begin from Chhatnag in Prayagraj and conclude at Assi Ghat in Varanasi. Priyanka offered prayers at Sangam before setting out for the journey.