Article Detail Longest rail tunnel in the world ? Answer: Seikan Tunnel (Japan - 53.9 Km) Similar Questions : 1. Which is smallest planet ? Answer: Mercury 2. Which is the longest wall in world ? Answer: Great wall of China 3. Where is largest Archipelago ? Answer: Indonesia 4. Which is longest railway station ? Answer: Grand Central Terminal, Chicago(USA). 5. Which is the highest waterfall in the world ? Answer: Angel, Venezuela 6. Which is the largest Mosque in World ? Answer: Masjid al Haram (Saudi Arabia) 7. Which is the longest rail tunnel in India ? Answer: Pir Panjal (J&k, 11215 metre) Read more from - Longest and Largest