Jalangi River (Bengali: জলজ্ঞী নদী), is a branch of the Ganges river in Murshidabad and Nadia districts in the Indian state of West Bengal. It flows into the Bhagirathi river and strengthens its lower channel, the Hooghly. The river below the point where the Jalanagi meets the Ganges is known as Hooghly and the course above it from the point of its separation from the main flow of the Ganges to its confluence with the Jalangi, it is called Bhagirathi.