Article Detail Which is Largest railway route in India ? Answer: Dibrugarh in Assam to Kannyakumari in Tamil Nadu. Similar Questions : 1. Which is Longest national highway of India ? Answer: NH-7 ( Varanasi to Kanyakumari - 2,369 km) 2. Which is the largest sea in the world ? Answer: Philippine Sea 3. Which is the largest desert in India ? Answer: Thar (Rajasthan) 4. Which is largest continent ? Answer: Asia 5. Which is the largest Zoo in India ? Answer: Zoological Gardens, Alipur, Kolkata 6. Which is the lightest gas ? Answer: Hydrogen 7. Which is Largest Dome in World ? Answer: St. Peter's Basilica (Rome) Read more from - Longest and Largest