Brahmaputra River branch, which contains the majority of the river's flow, continues due south as the Jamuna () to merge with the lower Ganga, called the Padma River (). The eastern branch, formerly the larger, but now much smaller, is called the lower or old Brahmaputra (). It curves southeast to join the Meghna River near Dhaka. The Padma and Meghna converge near Chandpur and flow out into the Bay of Bengal. This final part of the river is called Meghna. The Brahmaputra enters the plains of Bangladesh after turning south around the Garo Hills below Dhuburi, India. After flowing past Chilmari,
Ganga in Hinduism known by is Jahnavi, Story has it that once Ganga came down to Earth, on her way to Bhagiratha, her rushing waters created turbulence and destroyed the fields and the sadhana of a sage called Jahnu. He was angered by this and drank up all of Ganga's waters. Upon this, the Gods prayed to Jahnu to release Ganga so that she could proceed with her mission. Pleased with their prayers, Jahnu released Ganga(her waters) from his ears. Hence the name "Jahnavi"(daughter of Jahnu) for Ganga. It is sometimes believed that the river will finally dry up at the end of