Name the longest river in India.
The longest river in India is the River Ganga or "Ganges" which is 2,525 km (1,569 miles) long.
Complete the following task based on the instruction and optional input provided.### Instruction:
Name the longest river in India.

### Output:
The longest river in India is the River Ganga or "Ganges" which is 2,525 km (1,569 miles) long.