Article Detail Which is the longest day in the year ? Answer: June 21 Similar Questions : 1. Which is the Largest lake of the world ? Answer: Caspian Sea (371,000 sq km) 2. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) 3. Which is the longest road in India ? Answer: Grand Trunk Road (2500 Km) 4. What is the name of tallest Animal ? Answer: Giraffe 5. Where is largest Archipelago ? Answer: Indonesia 6. Which is Highest Battle field ? Answer: Siachin Glacier. Mastguru team Salutes to Indian soldiers. 7. Which is the largest epic in world ? Answer: Mahabharat Read more from - Longest and Largest