The Ganga river between Allahabad and Haldia is being termed as :
The National Waterway 1 or NW-1 or Ganga-Bhagirathi-Hooghly river system is located in India and runs from Haldia (Sagar) to Prayagraj across the Ganges, Bhagirathi, and Hooghly river systems. It is 1,620 km (1,010 mi) long, making it the longest waterway in India. It is of prime importance amongst all the national waterways considering its locational advantages.