Article Detail Which is Longest Dam in India ? Answer: Hirakod Dam (Orissa) Similar Questions : 1. Which is Highest Award in India ? Answer: Bharat Ratna 2. Which is the largest desert in India ? Answer: Thar (Rajasthan) 3. Which is the longest River in the World ? Answer: Nile 4. Longest rail tunnel in the world ? Answer: Seikan Tunnel (Japan - 53.9 Km) 5. Which is Longest national highway of India ? Answer: NH-7 ( Varanasi to Kanyakumari - 2,369 km) 6. Which is smallest planet ? Answer: Mercury 7. Which is the biggest country in Area ? Answer: Russia Read more from - Longest and Largest