Which is the longest inland national waterways?

[LokeshCBSE]

Study the following data carefully and answer the questions that follow:

1. Which is the longest inland national waterways?
2. Which two terminal cities are joined by the National Waterways No.2?
3. In which region of Indian are inland waterways widely used?

[LokeshCBSE]

1. N.W. 1 is the longest Inland National Waterway.
2. National Waterway No. 2 links Sadya and Dhubri.
3. Inland waterways are widely used in the north-eastern region of India.