Article Detail Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) Similar Questions : 1. Which is the largest Zoo in the World ? Answer: Berlin Zoological Garden (Germany) 2. Which is the Densest populated State of India ? Answer: West Bengal 3. Which is the longest wall in world ? Answer: Great wall of China 4. Which is smallest continent of world ? Answer: Australia 5. Which is Highest Award in India ? Answer: Bharat Ratna 6. Which is Biggest ocean in the world ? Answer: Pacific ocean 7. Which is the largest Zoo in India ? Answer: Zoological Gardens, Alipur, Kolkata Read more from - Longest and Largest