Article Detail Which is the longest River in the World ? Answer: Nile Ad Similar Questions : 1. Which is Longest national highway of India ? Answer: NH-7 ( Varanasi to Kanyakumari - 2,369 km) 2. Which is the largest Zoo in India ? Answer: Zoological Gardens, Alipur, Kolkata 3. Which is largest continent ? Answer: Asia 4. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) 5. Which is the longest day in the year ? Answer: June 21 6. Which is smallest planet ? Answer: Mercury 7. What is the name of brightest star ? Answer: Sirius Read more from - Longest and Largest