Article Detail Which is longest river in world ? Answer: Nile, Africa Similar Questions : 1. Which is the smallest state of India by Population ? Answer: Sikkim 2. Which is Place of heaviest rainfall ? Answer: Mausinram (Meghalaya) 3. Which Indian state is having longest coastline ? Answer: Gujrat 4. Which is the largest epic in world ? Answer: Mahabharat 5. Longest rail tunnel in the world ? Answer: Seikan Tunnel (Japan - 53.9 Km) 6. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) 7. Which is Largest Dome in World ? Answer: St. Peter's Basilica (Rome) Read more from - Longest and Largest