Article Detail Longest rail tunnel in the world ? Answer: Seikan Tunnel (Japan - 53.9 Km) Similar Questions : 1. Which is largest continent ? Answer: Asia 2. Which is the largest desert in India ? Answer: Thar (Rajasthan) 3. Which is largest Creature in world ? Answer: Blue Whale 4. Which is longest river in world ? Answer: Nile, Africa 5. Which is the highest dam in India ? Answer: Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 metres) 6. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) 7. Which state is largest by Population ? Answer: Uttar Pradesh Read more from - Longest and Largest