Jalangi River (Bengali: জলঙ্গী 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 Jalangi meets the Ganges is known as the 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, is called the Bhagirathi.
The Hooghly River (/ˈhuːɡli/; Bengali: Hugli [ˈɦuɡli]) is the westernmost distributary of the Ganges, situated in West Bengal, India. It is known in its upper reaches as the Bhagirathi. The Bhagirathi splits off from the main branch of the Ganges at Giria. A short distance west, it meets the man-made Farakka Feeder Canal, which massively increases its flow. The river then flows south to join the Jalangi at Nabadwip, where it becomes the Hooghly proper. The Hooghly continues southwards, passing through the metropolis of Kolkata. Thereafter, it empties into the Bay of Bengal. Its tributaries include the Ajay, Damodar, Rupnarayan, and Haldi.
The Hooghly has religious significance as Hindus consider the river sacred. It also plays a major role in the agriculture, industry, and climate of the state.